/* Python Academy — Stylesheet */
:root{--bg:#f0f9ff;--surface:#fff;--card:#fff;--border:#bae6fd;--accent:#0ea5e9;--accent2:#0284c7;--green:#059669;--yellow:#d97706;--red:#dc2626;--text:#0f172a;--muted:#64748b;--mono:'Space Mono',monospace;--sans:'DM Sans',sans-serif;--sidebar-w:280px}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--sans);background:var(--bg);color:var(--text);min-height:100vh;display:flex}
.sidebar{width:var(--sidebar-w);height:100vh;background:#0284c7;position:fixed;top:0;left:0;display:flex;flex-direction:column;overflow:hidden;z-index:200}
.sidebar-header{padding:28px 20px 20px;border-bottom:1px solid rgba(255,255,255,.15);cursor:pointer;transition:background .15s}
.sidebar-header:hover{background:rgba(255,255,255,.08)}
.sidebar-header h1{font-family:var(--sans);font-weight:700;font-size:16px;color:#e0f2fe;letter-spacing:-.3px;margin-bottom:4px}
.sidebar-header p{font-size:11px;color:rgba(255,255,255,.6);letter-spacing:.5px}
.sidebar-search{padding:14px 16px;border-bottom:1px solid rgba(255,255,255,.12);position:relative}
.sidebar-search svg{position:absolute;left:28px;top:50%;transform:translateY(-50%);color:rgba(255,255,255,.5);pointer-events:none}
.sidebar-search input{width:100%;padding:8px 12px 8px 34px;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.2);border-radius:6px;color:#fff;font-family:var(--sans);font-size:13px;outline:none}
.sidebar-search input::placeholder{color:rgba(255,255,255,.5)}
.sidebar-search input:focus{border-color:#7dd3fc}
.chapter-list{flex:1;overflow-y:auto;padding:8px 0;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.2) transparent;min-height:0}
.chapter-item{display:flex;align-items:center;gap:10px;padding:9px 20px;cursor:pointer;transition:all .15s;font-size:13px;color:rgba(255,255,255,.75);border-left:3px solid transparent}
.chapter-item:hover{background:rgba(255,255,255,.08);color:rgba(255,255,255,.9)}
.chapter-item.active{background:rgba(255,255,255,.15);color:#fff}
.chapter-item.done .ch-num{color:#a8e6c0}
.chapter-item.done .ch-check{display:inline}
.ch-check{display:none;font-size:11px;margin-left:auto;color:#a8e6c0}
.ch-num{font-family:var(--mono);font-size:9px;color:rgba(255,255,255,.35);min-width:18px}
.ch-title{flex:1;line-height:1.3}
.sidebar-footer{padding:14px 16px;border-top:1px solid rgba(255,255,255,.15);display:flex;flex-direction:column;gap:6px}
.sidebar-btn{display:flex;align-items:center;gap:8px;padding:8px 12px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:7px;color:rgba(255,255,255,.9);font-family:var(--sans);font-size:12px;cursor:pointer;transition:all .15s;text-align:left}
.sidebar-btn:hover{background:rgba(255,255,255,.22);color:#fff;border-color:rgba(255,255,255,.35)}
.progress-bar-wrap{padding:6px 0 2px}
.progress-label{display:flex;justify-content:space-between;font-size:11px;color:rgba(255,255,255,.55);margin-bottom:5px;font-family:var(--sans)}
.progress-track{height:4px;background:rgba(255,255,255,.15);border-radius:2px;overflow:hidden}
.progress-fill{height:100%;background:#7dd3fc;border-radius:2px;transition:width .4s ease}
.main{margin-left:var(--sidebar-w);flex:1;min-height:100vh;display:flex;flex-direction:column;background:#fff;}
.content-header{background:#fff;border-bottom:1px solid var(--border);padding:36px 48px 28px;}

.content-header .ch-badge{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:10px;color:var(--accent);background:#e0f2fe;border:1px solid #bae6fd;border-radius:20px;padding:3px 10px;margin-bottom:12px;text-transform:uppercase;letter-spacing:1px}
.content-header h2{font-family:var(--sans);font-weight:700;font-size:clamp(20px,3vw,30px);color:var(--text);letter-spacing:-.5px;margin-bottom:8px}
.content-header p{font-size:14px;color:var(--muted);max-width:600px;line-height:1.6}
.tabs{display:flex;border-bottom:1px solid var(--border);background:var(--surface);padding:0 48px}
.tab{padding:14px 24px;font-family:var(--sans);font-size:13px;font-weight:600;color:var(--muted);cursor:pointer;border-bottom:2px solid transparent;transition:all .15s;background:none;border-top:none;border-left:none;border-right:none;letter-spacing:.2px;}
.tab:hover{color:var(--accent)}
.tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.content-body{flex:1;padding:40px 48px;max-width:860px;background:#fff;}
.lesson-text p{font-size:15px;color:#1e293b;line-height:1.85;margin-bottom:18px;animation:fadeUp .4s ease both;}
.lesson-text p:nth-child(1){animation-delay:.05s}.lesson-text p:nth-child(2){animation-delay:.10s}
.lesson-text p:nth-child(3){animation-delay:.15s}.lesson-text p:nth-child(4){animation-delay:.20s}
.lesson-text p:nth-child(5){animation-delay:.25s}
@keyframes fadeUp{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.section-label{font-family:var(--sans);font-weight:700;font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:1.2px;margin:32px 0 14px;}
.section-label:first-child{margin-top:0}
.code-wrap{position:relative;margin-bottom:14px}
code,pre{font-family:var(--mono);font-size:13px;background:#f8fafc;border:1px solid var(--border);display:block;padding:14px 44px 14px 16px;border-radius:8px;color:#0c4a6e;white-space:pre;overflow-x:auto;line-height:1.65}
.copy-btn{position:absolute;top:8px;right:8px;background:#fff;border:1px solid var(--border);color:var(--muted);font-size:10px;padding:3px 8px;border-radius:4px;cursor:pointer;font-family:var(--mono);transition:all .15s}
.copy-btn:hover{border-color:var(--accent);color:var(--accent)}
.tip-box{padding:12px 16px;background:#ecfdf5;border-left:3px solid var(--green);border-radius:0 8px 8px 0;font-size:13.5px;color:#065f46;line-height:1.55;margin-top:6px}
.action-row{display:flex;gap:10px;margin-top:28px;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:7px;padding:10px 22px;background:#0284c7;color:#fff;border:none;border-radius:8px;font-family:var(--sans);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;}
.btn-primary:hover{background:#0369a1;}
.btn-secondary{display:inline-flex;align-items:center;gap:7px;padding:10px 22px;background:#fff;color:#0284c7;border:1.5px solid #bae6fd;border-radius:8px;font-family:var(--sans);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;}
.btn-secondary:hover{background:#f0f9ff;border-color:#0284c7;}
.btn-done{display:inline-flex;align-items:center;gap:7px;padding:10px 22px;background:#ecfdf5;color:#059669;border:1.5px solid #6ee7b7;border-radius:8px;font-family:var(--sans);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;}
.btn-done:hover{background:#d1fae5;border-color:#34d399;}
/* GO DEEPER */
.go-deeper-wrap{margin-top:32px;border:1px solid var(--border);border-radius:12px;overflow:hidden}
.go-deeper-btn{width:100%;display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:linear-gradient(135deg,#f0f9ff,#e0f2fe);border:none;cursor:pointer;font-family:var(--sans);font-size:14px;font-weight:600;color:var(--accent);transition:background .2s}
.go-deeper-btn:hover{background:linear-gradient(135deg,#e0f2fe,#bae6fd)}
.go-deeper-btn .gd-arrow{font-size:12px;transition:transform .3s;color:var(--muted)}
.go-deeper-btn.open .gd-arrow{transform:rotate(180deg)}
.go-deeper-content{display:none;padding:0}
.go-deeper-content.open{display:block}
.level-section{padding:24px 24px 20px;border-top:1px solid var(--border)}
.level-section:first-child{border-top:none}
.level-header{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.level-badge{display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:700;padding:4px 12px;border-radius:20px;text-transform:uppercase;letter-spacing:.5px}
.level-intermediate{background:#fff8e1;color:#b86e00;border:1px solid #ffe082}
.level-advanced{background:#fdecea;color:#c0392b;border:1px solid #f5b8b3}
.level-section h4{font-family:var(--mono);font-size:12px;color:var(--text);letter-spacing:-.3px}
.level-section p{font-size:14px;color:#1e293b;line-height:1.75;margin-bottom:12px}
.level-section code{font-size:12.5px;margin-bottom:10px}
.level-tip{padding:10px 14px;background:#e0f2fe;border-left:3px solid var(--accent);border-radius:0 7px 7px 0;font-size:13px;color:#0c4a6e;line-height:1.5;margin-top:8px}
/* EXAMPLES */
.example-card{background:#fff;border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-bottom:16px;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.example-card-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:#f0f9ff;border-bottom:1px solid var(--border)}
.example-card-header span{font-family:var(--mono);font-size:11px;color:var(--muted)}
.example-card code{border-radius:0;border:none;background:#f8fafc}
/* QUIZ */
.quiz-wrap{max-width:680px}
.quiz-q{background:#fff;border:1px solid var(--border);border-radius:10px;padding:20px;margin-bottom:14px;box-shadow:0 1px 4px rgba(0,0,0,.04);animation:fadeUp .3s ease both;transition:border-color .3s,background .3s}
.quiz-q-text{font-size:14px;font-weight:600;color:var(--text);margin-bottom:14px;line-height:1.5}
.quiz-option{display:flex;align-items:center;gap:10px;padding:9px 12px;border-radius:7px;border:1px solid var(--border);margin-bottom:7px;cursor:pointer;font-size:13.5px;transition:all .15s;background:#f8fafc}
.quiz-option:hover{border-color:var(--accent);background:#e0f2fe}
.quiz-option input{accent-color:var(--accent)}
.quiz-result-box{padding:16px 20px;border-radius:10px;font-size:15px;font-weight:600;margin-top:20px;text-align:center;display:none}
.quiz-result-box.pass{background:#edf7f1;color:var(--green);border:1px solid #b6ddc8}
.quiz-result-box.fail{background:#fdecea;color:#9c2a1e;border:1px solid #f5b8b3}
.quiz-q.q-correct{border-color:#b6ddc8;background:#f4fbf7}
.quiz-q.q-wrong{border-color:#f5b8b3;background:#fdf5f5}
.quiz-answer-reveal{margin-top:10px;padding:10px 14px;background:#ecfdf5;border-left:3px solid var(--green);border-radius:0 6px 6px 0;font-size:13px;color:#065f46;display:none;line-height:1.5}
.quiz-q.q-wrong .quiz-answer-reveal{display:block}
.quiz-option.opt-correct{border-color:var(--green)!important;background:#edf7f1!important;color:var(--green)!important;font-weight:700}
.quiz-option.opt-wrong-selected{border-color:var(--red)!important;background:#fdecea!important;color:var(--red)!important}
/* PRACTICE */
.practice-inner{background:#fff;border:1px solid var(--border);border-radius:12px;padding:28px;box-shadow:0 2px 12px rgba(0,0,0,.06)}
textarea{width:100%;height:220px;background:#fafaf8;color:#3d2e1e;border:1.5px solid var(--border);border-radius:8px;padding:14px 16px;font-family:var(--mono);font-size:13px;line-height:1.7;resize:vertical;outline:none;transition:border-color .2s}
textarea:focus{border-color:var(--accent)}
.run-btn{display:inline-flex;align-items:center;gap:8px;margin-top:12px;padding:10px 24px;background:#0284c7;color:#fff;border:none;border-radius:8px;font-family:var(--sans);font-size:13px;font-weight:600;cursor:pointer;transition:all .15s;}
.run-btn:hover{background:#0369a1;}
.run-btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.py-status{display:inline-flex;align-items:center;gap:6px;margin-left:14px;font-size:12px;color:var(--muted);font-family:var(--mono);vertical-align:middle}
.py-dot{width:7px;height:7px;border-radius:50%;background:#d4c4b0;transition:background .3s}
.py-dot.ready{background:var(--green);box-shadow:0 0 6px rgba(46,125,82,.4)}
#output{margin-top:14px;padding:14px 16px;background:#f8fafc;border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:8px;font-family:var(--mono);font-size:13px;color:#0c4a6e;white-space:pre-wrap;min-height:60px;max-height:260px;overflow-y:auto;line-height:1.65}
/* WELCOME */
.welcome-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:28px;}
.welcome-card{background:#f0f9ff;border:1.5px solid #bae6fd;border-radius:10px;padding:16px 18px;cursor:pointer;transition:all .15s;display:flex;flex-direction:column;gap:6px;position:relative;overflow:hidden;height:76px;justify-content:center;}
.welcome-card::before{content:'';position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--accent);border-radius:10px 0 0 10px;transition:width .18s ease}
.welcome-card:hover{background:#e0f2fe;border-color:#0284c7;}

.welcome-card .wc-num{font-family:var(--mono);font-size:9px;color:var(--muted);letter-spacing:.5px}
.welcome-card .wc-title{font-size:13px;font-weight:600;color:var(--text);line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.welcome-card.done-card::before{background:var(--accent)}
.welcome-card.done-card .wc-num{color:var(--accent)}
.welcome-card.done-card{background:#e0f2fe;border-color:#7dd3fc;}.welcome-card.done-card .wc-title{color:#0369a1}
.welcome-card.done-card .wc-title::after{content:' ✓';color:var(--green);font-size:11px;font-weight:700}
/* STORY */
.story-page{position:relative;min-height:100vh;flex:1;background:#050b1f;color:#e8f0ff;font-family:'Nunito',sans-serif;overflow-x:hidden}
.story-stars{position:fixed;inset:0;pointer-events:none;z-index:0;background:radial-gradient(1px 1px at 10% 15%,rgba(255,255,255,.8) 0%,transparent 100%),radial-gradient(1px 1px at 25% 60%,rgba(255,255,255,.6) 0%,transparent 100%),radial-gradient(1px 1px at 40% 30%,rgba(255,255,255,.9) 0%,transparent 100%),radial-gradient(1px 1px at 55% 75%,rgba(255,255,255,.7) 0%,transparent 100%),radial-gradient(2px 2px at 78% 38%,rgba(255,220,100,.5) 0%,transparent 100%)}
.story-header{position:relative;z-index:10;text-align:center;padding:40px 24px 28px;background:linear-gradient(180deg,rgba(76,201,240,.07) 0%,transparent 100%);border-bottom:1px solid #1a3060}
.story-back-btn{position:absolute;left:24px;top:24px;display:inline-flex;align-items:center;gap:6px;padding:8px 14px;background:rgba(255,255,255,.06);border:1px solid #1a3060;border-radius:8px;color:#7b93cc;font-size:13px;cursor:pointer;font-family:'Nunito',sans-serif;transition:all .15s}
.story-back-btn:hover{background:rgba(255,255,255,.12);color:#e8f0ff}
.story-planet-icon{font-size:52px;display:block;margin-bottom:10px;animation:storyFloat 4s ease-in-out infinite}
@keyframes storyFloat{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.story-header h2{font-family:'Fredoka One',cursive;font-size:clamp(24px,4vw,44px);color:#f9c74f;text-shadow:0 0 30px rgba(249,199,79,.4);margin-bottom:6px}
.story-header p{color:#7b93cc;font-size:14px;max-width:480px;margin:0 auto 18px;line-height:1.6}
.story-header-stats{display:flex;justify-content:center;gap:28px;flex-wrap:wrap}
.sh-stat{text-align:center}.sh-stat-num{font-family:'Fredoka One',cursive;font-size:20px;color:#4cc9f0}.sh-stat-label{font-size:10px;color:#7b93cc;text-transform:uppercase;letter-spacing:1px}
.story-controls{position:sticky;top:0;z-index:50;background:rgba(5,11,31,.97);backdrop-filter:blur(14px);border-bottom:1px solid #1a3060;padding:12px 24px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:center}
.story-search-wrap{position:relative;max-width:300px;flex:1}
.story-search-wrap svg{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:#7b93cc;pointer-events:none}
.story-search-wrap input{width:100%;padding:8px 12px 8px 34px;background:#0d1d40;border:1px solid #1a3060;border-radius:8px;color:#e8f0ff;font-family:'Nunito',sans-serif;font-size:13px;outline:none}
.story-search-wrap input::placeholder{color:#7b93cc}
.sf-btn{padding:6px 12px;background:#0d1d40;border:1px solid #1a3060;border-radius:20px;color:#7b93cc;font-family:'Nunito',sans-serif;font-size:12px;font-weight:700;cursor:pointer;transition:all .15s}
.sf-btn:hover{border-color:#4cc9f0;color:#4cc9f0}.sf-btn.sf-active{background:#4cc9f0;border-color:#4cc9f0;color:#000}
.story-grid{position:relative;z-index:5;max-width:1060px;margin:0 auto;padding:28px 24px 60px;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;align-items:start}
.sc{background:#0d1d40;border:1px solid #1a3060;border-radius:16px;overflow:hidden;cursor:pointer;transition:transform .2s,box-shadow .2s}
.sc:hover{transform:translateY(-4px);box-shadow:0 12px 40px rgba(76,201,240,.15);border-color:rgba(76,201,240,.3)}
.sc-banner{height:100px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;position:relative;overflow:hidden}
.sc-char{font-size:46px;filter:drop-shadow(0 0 10px rgba(255,255,255,.3));animation:storyFloat 3s ease-in-out infinite;z-index:1}
.sc-bg-planet{font-size:68px;opacity:.15;position:absolute;right:-8px;bottom:-14px}
.sc-tag{font-size:10px;padding:2px 8px;border-radius:20px;font-weight:700;text-transform:uppercase;z-index:1;align-self:flex-start;margin-top:12px}
.sc-tag-beginner{background:rgba(67,233,123,.15);color:#43e97b;border:1px solid rgba(67,233,123,.3)}
.sc-tag-intermediate{background:rgba(249,199,79,.15);color:#f9c74f;border:1px solid rgba(249,199,79,.3)}
.sc-body{padding:14px 18px 18px}.sc-cat{font-size:10px;color:#7b93cc;text-transform:uppercase;letter-spacing:1px;margin-bottom:3px;font-weight:700}
.sc-name{font-family:'Fredoka One',cursive;font-size:20px;color:#f9c74f;margin-bottom:5px}
.sc-tagline{font-size:12.5px;color:#7b93cc;line-height:1.45;margin-bottom:12px}
.sc-read-btn{display:inline-flex;align-items:center;gap:5px;padding:7px 14px;background:rgba(76,201,240,.1);border:1px solid rgba(76,201,240,.25);border-radius:7px;color:#4cc9f0;font-family:'Nunito',sans-serif;font-size:12px;font-weight:700;cursor:pointer}
.sm-overlay{display:none;position:fixed;inset:0;background:rgba(5,11,31,.9);backdrop-filter:blur(8px);z-index:2000;align-items:center;justify-content:center;padding:20px}
.sm-overlay.sm-open{display:flex}
.sm{background:#0a1535;border:1px solid #1a3060;border-radius:20px;max-width:660px;width:100%;max-height:88vh;overflow-y:auto;position:relative;animation:smPop .3s cubic-bezier(.34,1.56,.64,1) both;scrollbar-width:thin;scrollbar-color:#1a3060 transparent}
@keyframes smPop{from{opacity:0;transform:scale(.88) translateY(20px)}to{opacity:1;transform:scale(1) translateY(0)}}
.sm-close{position:absolute;top:14px;right:14px;width:30px;height:30px;background:rgba(255,255,255,.06);border:1px solid #1a3060;border-radius:50%;color:#7b93cc;font-size:14px;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:10;transition:all .15s}
.sm-close:hover{background:#f72585;color:#fff;border-color:#f72585}
.sm-banner{height:140px;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;border-radius:20px 20px 0 0}
.sm-banner-char{font-size:76px;filter:drop-shadow(0 0 22px rgba(255,255,255,.4));animation:storyFloat 3s ease-in-out infinite;z-index:1}
.sm-banner-bg{position:absolute;inset:0;opacity:.1;font-size:150px;display:flex;align-items:center;justify-content:center}
.sm-body{padding:22px 26px 30px}.sm-cat{font-size:10px;color:#7b93cc;text-transform:uppercase;letter-spacing:1.5px;font-weight:700;margin-bottom:3px}
.sm-title{font-family:'Fredoka One',cursive;font-size:30px;color:#f9c74f;margin-bottom:5px}
.sm-sub{font-size:13px;color:#7b93cc;margin-bottom:18px;line-height:1.5}
.ssl{font-size:10px;font-weight:800;text-transform:uppercase;letter-spacing:1.5px;color:#4cc9f0;margin:18px 0 8px;display:flex;align-items:center;gap:8px}
.ssl::after{content:'';flex:1;height:1px;background:#1a3060}
.st{font-size:14.5px;line-height:1.85;color:#c8d8f8;background:rgba(255,255,255,.02);border:1px solid #1a3060;border-left:3px solid #f9c74f;border-radius:0 10px 10px 0;padding:14px 16px}
.st p{margin-bottom:10px}.st p:last-child{margin-bottom:0}
.s-char-name{color:#f9c74f;font-weight:800}
.s-code-word{font-family:'Courier New',monospace;font-size:12px;background:rgba(76,201,240,.12);color:#4cc9f0;padding:1px 5px;border-radius:4px}
.sc-code-block{background:#020814;border:1px solid #1a3060;border-radius:10px;overflow:hidden;margin:6px 0 10px}
.sc-code-header{display:flex;align-items:center;justify-content:space-between;padding:7px 13px;background:rgba(255,255,255,.03);border-bottom:1px solid #1a3060}
.sc-code-header span{font-size:11px;color:#7b93cc;font-family:'Courier New',monospace}
.sc-copy-btn{font-size:10px;padding:2px 7px;background:rgba(76,201,240,.1);border:1px solid rgba(76,201,240,.2);border-radius:4px;color:#4cc9f0;cursor:pointer;transition:all .15s}
.sc-copy-btn:hover{background:rgba(76,201,240,.2)}
.sc-code-block pre{padding:12px 14px;font-family:'Courier New',monospace;font-size:12.5px;color:#a8d8f8;white-space:pre;overflow-x:auto;line-height:1.65;background:none;border:none;border-radius:0;margin:0}
.s-moral{background:rgba(249,199,79,.07);border:1px solid rgba(249,199,79,.2);border-left:3px solid #f9c74f;border-radius:0 10px 10px 0;padding:13px 15px;font-size:13.5px;color:#f5dfa0;line-height:1.6}
.s-moral strong{color:#f9c74f}
.sm-nav{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.sm-nav-btn{flex:1;padding:10px 16px;border-radius:10px;font-family:'Nunito',sans-serif;font-size:13px;font-weight:700;cursor:pointer;transition:all .15s;min-width:110px;text-align:center}
.sm-prev{background:rgba(255,255,255,.04);border:1px solid #1a3060;color:#7b93cc}
.sm-prev:hover{background:rgba(255,255,255,.09);color:#e8f0ff}
.sm-next{background:linear-gradient(135deg,#f9c74f,#f8961e);border:none;color:#000}
.sm-next:hover{filter:brightness(1.08);transform:translateY(-1px)}
.s-empty{grid-column:1/-1;text-align:center;padding:50px 20px;color:#7b93cc;font-family:'Nunito',sans-serif}
/* ── PROFILE PAGE ───────────────────────────────────── */
.profile-page{padding:0;flex:1;display:flex;flex-direction:column}
.profile-hero{display:none}
.profile-avatar-row{display:flex;align-items:center;gap:20px;margin-bottom:20px;position:relative;z-index:1}
.profile-avatar-big{font-size:64px;width:90px;height:90px;background:rgba(255,255,255,.15);border:3px solid rgba(253,232,200,.4);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(0,0,0,.2);flex-shrink:0}
.profile-name{font-family:var(--sans);font-weight:700;font-size:26px;color:#e0f2fe;font-weight:700;letter-spacing:-.5px;margin-bottom:4px}
.profile-username{font-size:13px;color:rgba(224,242,254,.6);font-family:var(--sans)}
.profile-badge-big{display:inline-flex;align-items:center;gap:7px;margin-top:8px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:20px;padding:5px 14px;font-size:12px;color:#e0f2fe;font-weight:700}
.profile-top{display:grid;grid-template-columns:1fr 1fr;gap:20px;background:#f0f9ff;padding:28px 32px;border-bottom:1px solid #bae6fd}
.profile-left-col{display:flex;flex-direction:column}
.profile-right-col{display:grid;grid-template-columns:1fr 1fr;gap:10px;align-content:start}
.profile-id-row{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.profile-rank-pill{display:inline-block;font-size:11px;font-weight:700;color:#0284c7;background:#e0f2fe;padding:3px 10px;border-radius:6px;margin-top:4px}
.profile-sec-label{font-size:9px;font-weight:700;color:#94a3b8;text-transform:uppercase;letter-spacing:.8px;margin-bottom:6px}
.profile-prog-row{display:flex;justify-content:space-between;font-size:11px;color:#64748b;margin-bottom:4px}
.profile-prog-name{font-weight:500}
.profile-prog-count{color:#0284c7;font-weight:600}
.profile-bar-track{height:4px;background:#e2e8f0;border-radius:2px;overflow:hidden;margin-bottom:2px}
.profile-bar-fill{height:100%;border-radius:2px;transition:width .5s ease}
.profile-stat-card{background:#fff;border:1.5px solid #bae6fd;border-radius:10px;padding:12px;text-align:center}
.profile-stat-num{font-size:20px;font-weight:700;color:#0284c7;display:block}
.profile-stat-label{font-size:9px;color:#94a3b8;text-transform:uppercase;letter-spacing:.5px;margin-top:3px;display:block}
.profile-body{padding:28px 32px;max-width:900px;flex:1}
.profile-section-title{font-family:var(--sans);font-weight:600;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:1.5px;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.profile-section-title::after{content:'';flex:1;height:1px;background:var(--border)}
/* Progress ring */
.ring-wrap{display:flex;align-items:center;gap:24px;background:#fff;border:1px solid var(--border);border-radius:14px;padding:22px 28px;margin-bottom:24px;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.ring-svg{flex-shrink:0}
.ring-track{fill:none;stroke:#e0f2fe;stroke-width:8}
.ring-fill{fill:none;stroke:url(#ringGrad);stroke-width:8;stroke-linecap:round;stroke-dasharray:283;transition:stroke-dashoffset .8s ease;transform:rotate(-90deg);transform-origin:50% 50%}
.ring-text{font-family:var(--sans);font-weight:700;font-size:18px;font-weight:700;fill:var(--text)}
.ring-sub{font-family:var(--sans);font-size:9px;fill:var(--muted)}
.ring-info{flex:1}
.ring-info h3{font-family:var(--sans);font-weight:700;font-size:16px;color:var(--text);margin-bottom:6px}
.ring-info p{font-size:14px;color:var(--muted);line-height:1.6}
/* Chapter grid */
.ch-progress-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;margin-bottom:28px}
.ch-progress-card{background:#fff;border:1px solid var(--border);border-radius:10px;padding:13px 15px;display:flex;align-items:center;gap:12px;cursor:pointer;transition:all .15s;box-shadow:0 1px 3px rgba(0,0,0,.03)}
.ch-progress-card:hover{border-color:var(--accent);box-shadow:0 3px 12px rgba(14,165,233,.1);transform:translateY(-1px)}
.ch-progress-card.ch-done{border-left:3px solid var(--green);background:#f4fbf7}
.ch-progress-card.ch-todo{border-left:3px solid var(--border)}
.ch-prog-icon{font-size:20px;flex-shrink:0}
.ch-prog-info{flex:1;min-width:0}
.ch-prog-title{font-size:12px;font-weight:700;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ch-prog-status{font-size:10px;font-family:var(--mono);margin-top:2px}
.ch-prog-status.done{color:var(--green)}
.ch-prog-status.todo{color:var(--muted)}
.ch-prog-check{font-size:14px;flex-shrink:0}
/* Activity timeline */
.activity-list{background:#fff;border:1px solid var(--border);border-radius:12px;overflow:hidden;margin-bottom:24px;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.activity-item{display:flex;align-items:center;gap:14px;padding:13px 18px;border-bottom:1px solid var(--border);transition:background .15s;cursor:pointer}
.activity-item:last-child{border-bottom:none}
.activity-item:hover{background:#fef8f1}
.activity-dot{width:10px;height:10px;border-radius:50%;flex-shrink:0}
.activity-dot.green{background:var(--green);box-shadow:0 0 6px rgba(46,125,82,.4)}
.activity-dot.amber{background:var(--accent);box-shadow:0 0 6px rgba(193,125,46,.4)}
.activity-text{flex:1;font-size:13px;color:var(--text)}
.activity-text span{color:var(--muted);font-size:11px;margin-left:6px;font-family:var(--mono)}
/* Next chapter card */
.next-card{background:#f0f9ff;border:1.5px solid #bae6fd;border-radius:10px;padding:14px 18px;display:flex;align-items:center;gap:14px;margin-bottom:20px;cursor:pointer;transition:all .15s}
.next-card:hover{border-color:#0284c7;background:#e0f2fe}
.next-card-num{width:32px;height:32px;border-radius:8px;background:#0284c7;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:#fff;flex-shrink:0}
.next-card-text h4{font-size:13px;font-weight:700;color:#0f172a;margin-bottom:2px}
.next-card-text p{font-size:11px;color:#64748b}
.next-card-arrow{margin-left:auto;font-size:16px;color:#0284c7}
/* Streak & join */
.profile-meta-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:24px}
.profile-meta-card{background:#fff;border:1px solid var(--border);border-radius:11px;padding:16px 18px;box-shadow:0 1px 3px rgba(0,0,0,.03)}
.profile-meta-card h4{font-family:var(--sans);font-weight:600;font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:8px}
.profile-meta-card .meta-val{font-family:var(--sans);font-size:18px;color:var(--text);font-weight:700}
.profile-meta-card .meta-sub{font-size:12px;color:var(--muted);margin-top:2px}
/* ── RANK LADDER ───────────────────────────────────── */
.ranks-wrap{display:flex;flex-direction:column;gap:10px;margin-bottom:28px}
.rank-card{display:flex;align-items:center;gap:16px;background:#fff;border:1.5px solid var(--border);border-radius:13px;padding:16px 20px;transition:all .2s;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.rank-card.rank-current{border-color:var(--accent);background:linear-gradient(135deg,#e0f2fe,#f0f9ff);box-shadow:0 4px 16px rgba(14,165,233,.12)}
.rank-card.rank-locked{opacity:.55;filter:grayscale(.4)}
.rank-card.rank-unlocked:not(.rank-current):hover{border-color:#bae6fd;transform:translateX(3px)}
.rank-left{display:flex;flex-direction:column;align-items:center;gap:3px;min-width:44px}
.rank-icon{font-size:32px;line-height:1}
.rank-locked-icon{font-size:10px;font-weight:800;color:var(--accent);font-family:var(--mono);white-space:nowrap}
.rank-middle{flex:1;min-width:0}
.rank-name{font-family:var(--mono);font-size:15px;font-weight:700;margin-bottom:2px}
.rank-req{font-family:var(--mono);font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:.8px;margin-bottom:4px}
.rank-desc{font-size:13px;color:var(--muted);line-height:1.5}
.rank-prog-wrap{margin-top:10px}
.rank-prog-track{height:6px;background:var(--border);border-radius:3px;overflow:hidden;margin-bottom:4px}
.rank-prog-fill{height:100%;border-radius:3px;transition:width .6s ease}
.rank-prog-label{font-family:var(--mono);font-size:10px;color:var(--muted)}
.rank-right{flex-shrink:0}
.rank-check{font-size:11px;font-weight:800;padding:4px 10px;border-radius:20px;border:1px solid;text-align:center}
.rank-need{background:#f7f4f0;border-color:var(--border);color:var(--muted)}
/* ── BREATH PAGE ─────────────────────────────────────── */
/* ── APPLE-STYLE BREATH OVERLAY ─────────────────────── */
.breath-overlay{position:fixed;inset:0;z-index:300;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 48px;background:linear-gradient(160deg,#f0f9ff 0%,#e0f2fe 45%,#bae6fd 75%,#f0f9ff 100%);transition:opacity .6s ease,transform .6s ease;pointer-events:all}
.breath-overlay.hidden{opacity:0;transform:scale(.97);pointer-events:none}
.breath-overlay::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 70% 60% at 50% 40%,rgba(14,165,233,.08) 0%,transparent 70%);pointer-events:none}
.breath-orbs{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.breath-orb{position:absolute;border-radius:50%;filter:blur(70px)}
.breath-orb-1{width:360px;height:360px;background:rgba(14,165,233,.12);top:-100px;right:-80px;animation:orbDrift 14s ease-in-out infinite}
.breath-orb-2{width:240px;height:240px;background:rgba(56,189,248,.08);bottom:-60px;left:-60px;animation:orbDrift 18s ease-in-out infinite reverse}
.breath-orb-3{width:180px;height:180px;background:rgba(2,132,199,.07);top:35%;right:8%;animation:orbDrift 11s ease-in-out infinite 2s}
@keyframes orbDrift{0%,100%{transform:translate(0,0)}50%{transform:translate(18px,-18px)}}
.breath-snake{font-size:86px;display:block;margin-bottom:22px;animation:breathSnake 4s ease-in-out infinite;filter:drop-shadow(0 8px 28px rgba(14,165,233,.25));position:relative;z-index:1}
@keyframes breathSnake{0%,100%{transform:translateY(0) rotate(-5deg) scale(1)}50%{transform:translateY(-18px) rotate(5deg) scale(1.07)}}
.breath-title{font-family:var(--sans);font-weight:700;font-size:clamp(26px,4.5vw,50px);color:var(--text);letter-spacing:-1.5px;margin-bottom:12px;position:relative;z-index:1;line-height:1.15}
.breath-title span{color:var(--accent)}
.breath-subtitle{font-size:15px;color:var(--muted);max-width:460px;line-height:1.8;margin-bottom:38px;position:relative;z-index:1}
.breath-stats{display:flex;gap:36px;justify-content:center;margin-bottom:44px;flex-wrap:wrap;position:relative;z-index:1}
.breath-stat{text-align:center}
.breath-stat-num{font-family:var(--sans);font-size:26px;font-weight:700;color:var(--accent);display:block}
.breath-stat-label{font-size:10px;color:var(--muted);text-transform:uppercase;letter-spacing:1.5px;margin-top:3px}
.breath-start-btn{display:inline-flex;align-items:center;gap:10px;padding:14px 38px;background:linear-gradient(135deg,#0284c7,#0ea5e9);color:#fff;border:none;border-radius:12px;font-family:var(--sans);font-size:15px;font-weight:700;cursor:pointer;transition:all .2s;box-shadow:0 6px 24px rgba(14,165,233,.3);position:relative;z-index:1}
.breath-start-btn:hover{transform:translateY(-3px);box-shadow:0 10px 32px rgba(14,165,233,.4)}
.breath-scroll-hint{margin-top:26px;font-size:11px;color:var(--muted);font-family:var(--mono);letter-spacing:1.5px;animation:breathHint 2s ease-in-out infinite;position:relative;z-index:1;text-transform:uppercase}
@keyframes breathHint{0%,100%{opacity:.35;transform:translateY(0)}50%{opacity:1;transform:translateY(5px)}}
.chapters-section{padding:48px 48px 36px;background:var(--bg)}

/* ── PROFILE ACTIVITY SECTIONS ──────────────────────── */
.activity-progress-wrap{background:#fff;border:1px solid var(--border);border-radius:12px;padding:20px 24px;margin-bottom:12px;box-shadow:0 1px 4px rgba(0,0,0,.04)}
.activity-progress-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.activity-progress-title{font-family:var(--mono);font-size:13px;font-weight:700;color:var(--text);display:flex;align-items:center;gap:8px}
.activity-progress-count{font-family:var(--mono);font-size:12px;color:var(--muted)}
.activity-progress-bar{height:8px;background:var(--border);border-radius:4px;overflow:hidden;margin-bottom:8px}
.activity-progress-fill{height:100%;border-radius:4px;transition:width .6s ease}
.activity-progress-sub{font-size:12px;color:var(--muted)}
.activity-story-list{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.activity-story-tag{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;background:#fef6ec;border:1px solid #f5d4a8;border-radius:20px;font-size:12px;color:var(--accent);font-weight:600;cursor:pointer;transition:all .15s}
.activity-story-tag:hover{background:#fdecd8;border-color:var(--accent)}
.activity-story-tag.unread{background:#f7f4f0;border-color:var(--border);color:var(--muted);cursor:default}
.community-post-item{background:#fff;border:1px solid var(--border);border-radius:10px;padding:14px 18px;margin-bottom:10px;box-shadow:0 1px 3px rgba(0,0,0,.03);cursor:pointer;transition:all .15s}
.community-post-item:hover{border-color:var(--accent);box-shadow:0 3px 10px rgba(193,125,46,.1)}
.community-post-type{display:inline-flex;align-items:center;gap:4px;font-size:10px;font-weight:700;padding:2px 8px;border-radius:10px;text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px}
.community-post-type.question{background:#edf7f1;color:var(--green)}
.community-post-type.tip{background:#fef6ec;color:var(--accent)}
.community-post-type.stuck{background:#fdecea;color:var(--red)}
.community-post-type.project{background:#f0f4ff;color:#4a6cf7}
.community-post-title{font-size:13px;font-weight:700;color:var(--text);margin-bottom:4px;line-height:1.4}
.community-post-meta{font-size:11px;color:var(--muted);font-family:var(--mono)}
.community-comment-item{background:#f7f4f0;border-left:3px solid var(--border);border-radius:0 8px 8px 0;padding:10px 14px;margin-bottom:8px;font-size:13px;color:#4a3c2d;line-height:1.5}
.community-comment-meta{font-size:11px;color:var(--muted);font-family:var(--mono);margin-top:4px}
.problems-chapter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:8px;margin-top:14px}
.prob-chapter-card{background:#f7f4f0;border:1px solid var(--border);border-radius:8px;padding:10px 12px;font-size:12px}
.prob-chapter-card.has-solved{background:#f4fbf7;border-color:#b6ddc8}
.prob-chapter-name{font-weight:700;color:var(--text);margin-bottom:3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.prob-chapter-count{font-family:var(--mono);font-size:10px;color:var(--muted)}
.prob-chapter-count.solved{color:var(--green)}
/* Next Chapter button */
.btn-next-chapter {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: #0284c7;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}
.btn-next-chapter:hover {
  background: #0369a1;
}


/* ── HAMBURGER (Academy mobile) ── */
.hamburger{
  display:none;position:fixed;top:12px;left:12px;z-index:1000;
  background:#0284c7;
  border:none;border-radius:9px;padding:8px 10px;cursor:pointer;
  flex-direction:column;gap:5px;
}
.hamburger span{display:block;width:22px;height:2.5px;background:#e0f2fe;border-radius:2px;transition:all .3s}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:199}
.sidebar-overlay.open{display:block}

/* ── TABLET (≤900px) ── */
@media(max-width:900px){
  :root{--sidebar-w:240px}
  .main{margin-left:240px}
}

/* ── MOBILE (≤600px) ── */
@media(max-width:600px){
  :root{--sidebar-w:270px}
  .sidebar{
    transform:translateX(-100%);
    transition:transform .28s ease;
    z-index:300;
  }
  .sidebar.open{transform:translateX(0)}
  .sidebar-overlay.open{display:block;z-index:299}
  .main{margin-left:0 !important;padding-top:52px}
  .hamburger{display:flex}
  .content-header{padding:20px 16px 16px}
  .content-header h2{font-size:20px}
  .tabs{padding:0 16px}
  .content-body{padding:16px}
  .welcome-grid{grid-template-columns:repeat(2,1fr) !important;gap:10px}
  .action-row{flex-wrap:wrap;gap:8px}
  .btn-primary,.btn-secondary,.btn-done{font-size:12px;padding:9px 16px}
}

/* ── Next Step Hint ── */
.next-step-hint{margin-top:32px;padding:16px 20px;background:#f0f9ff;border-left:3px solid #0284c7;border-radius:0 8px 8px 0;}
.next-step-label{font-size:10px;font-weight:700;color:#0284c7;text-transform:uppercase;letter-spacing:1px;margin-bottom:4px;}
.next-step-text{font-size:14px;color:#0f172a;line-height:1.6;}
.next-step-text strong{color:#0284c7;}