:root{--bg-gradient-start: hsl(222, 24%, 7%);--bg-gradient-end: hsl(220, 20%, 13%);--color-primary: hsl(262, 83%, 62%);--color-primary-hover: hsl(262, 85%, 68%);--color-primary-glow: hsla(262, 83%, 62%, .3);--color-success: hsl(142, 70%, 45%);--color-success-bg: hsla(142, 70%, 45%, .15);--color-success-border: hsla(142, 70%, 45%, .3);--color-danger: hsl(350, 75%, 50%);--color-danger-bg: hsla(350, 75%, 50%, .15);--color-danger-border: hsla(350, 75%, 50%, .3);--color-warning: hsl(38, 92%, 50%);--text-main: hsl(210, 17%, 95%);--text-muted: hsl(210, 12%, 72%);--text-dark: hsl(210, 10%, 45%);--glass-bg: hsla(220, 20%, 12%, .45);--glass-bg-hover: hsla(220, 20%, 16%, .55);--glass-border: hsla(220, 10%, 95%, .08);--glass-border-hover: hsla(220, 10%, 95%, .14);--glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, .37);--glass-blur: blur(12px);--max-width: 900px;--header-height: 72px;--footer-height: 60px;--border-radius: 16px;--border-radius-sm: 8px;--min-tap-target: 44px;--safe-padding: clamp(1rem, 5vw, 2.5rem);--transition-fast: .15s ease;--transition-normal: .3s cubic-bezier(.4, 0, .2, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}input,textarea,select{font-size:16px!important}body{font-family:Outfit,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:radial-gradient(circle at top center,var(--bg-gradient-end),var(--bg-gradient-start));color:var(--text-main);min-height:100vh;line-height:1.6;overflow-x:hidden}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:#0003}::-webkit-scrollbar-thumb{background:#393e46cc;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--color-primary)}.app-container{display:flex;flex-direction:column;min-height:100vh}.app-header{height:var(--header-height);padding:0 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var(--color-success)}.indicator-dot.confident{opacity:1}.practice-complete-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:4rem 2rem;gap:1rem;min-height:380px}.complete-icon{font-size:4rem;animation:float 2.5s ease-in-out infinite}.complete-title{font-size:2rem;font-weight:700;background:linear-gradient(135deg,var(--color-success),var(--color-primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:0}.complete-subtitle{color:var(--text-muted);font-size:1rem;max-width:420px;line-height:1.7;margin-bottom:0}.complete-actions{margin-top:.5rem}.practice-player{position:relative;min-height:calc(100vh - var(--header-height) - var(--footer-height) - 3rem);display:block!important;gap:0!important}.player-layout{display:grid;grid-template-columns:220px 1fr 180px;grid-template-areas:"sidebar-left center sidebar-right";align-items:start;padding:.5rem 0 2rem}.player-sidebar{position:sticky;top:calc(var(--header-height) + .5rem);display:flex;flex-direction:column;gap:1.25rem;padding:0 1rem}.left-sidebar{grid-area:sidebar-left;align-items:flex-start}.right-sidebar{grid-area:sidebar-right;align-items:flex-end}.player-center{grid-area:center;display:flex;flex-direction:column;gap:1.25rem}.player-mode-badge{display:inline-flex;align-items:center;gap:.5rem;font-size:.78rem;font-weight:700;padding:.35rem .9rem;border-radius:20px;letter-spacing:.02em}.player-mode-badge.mode-study{background:#8b5cf61f;color:var(--color-primary);border:1px solid rgba(139,92,246,.25)}.player-mode-badge.mode-practice{background:#fbbf241a;color:#f6a823;border:1px solid rgba(251,191,36,.2)}.sidebar-level-badge{font-size:.6rem;font-weight:800;letter-spacing:.06em;padding:.1rem 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pop{0%{transform:scale(1)}50%{transform:scale(1.4)}to{transform:scale(1)}}.confident-label{font-size:.78rem;font-weight:700;letter-spacing:.02em}.edge-nav-zone{position:fixed;top:var(--header-height);bottom:var(--footer-height);width:80px;z-index:200;display:flex;align-items:center;justify-content:center;pointer-events:none}.edge-nav-zone.left-zone{left:0}.edge-nav-zone.right-zone{right:0}.edge-nav-btn{pointer-events:auto;cursor:pointer;background:#12121d73;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1.5px solid rgba(255,255,255,.08);border-radius:50%;width:56px;height:56px;display:flex;align-items:center;justify-content:center;color:#fff9;padding:0;transition:all .3s cubic-bezier(.4,0,.2,1);-webkit-user-select:none;user-select:none;font-family:inherit;box-shadow:0 4px 16px #00000040}.left-zone .edge-nav-btn{margin-left:16px}.right-zone .edge-nav-btn{margin-right:16px}.left-zone .edge-nav-btn:hover{background:var(--color-primary);border-color:var(--color-primary);color:#fff;box-shadow:0 0 20px var(--color-primary-glow);transform:scale(1.1) translate(-4px)}.right-zone .edge-nav-btn:hover{background:var(--color-primary);border-color:var(--color-primary);color:#fff;box-shadow:0 0 20px var(--color-primary-glow);transform:scale(1.1) translate(4px)}.edge-nav-btn:active{transform:scale(.92)}.step-tag-speaking{background:#8b5cf626;color:var(--color-primary);border-color:#8b5cf64d;animation:pulse-border 1.5s ease-in-out infinite}.step-actions-row{display:flex;gap:.75rem;flex-wrap:wrap}@media (max-width: 900px){.player-layout{grid-template-columns:1fr;grid-template-areas:"sidebar-left" "center" "sidebar-right";padding:1rem 1rem 2rem}.player-sidebar{position:static;flex-direction:row;flex-wrap:wrap;gap:.75rem;padding:0}.left-sidebar,.right-sidebar{justify-content:flex-start;align-items:flex-start}.edge-nav-zone{display:none}.app-container:has(.player-view-container) .app-main{padding-left:1rem;padding-right:1rem}}@media (max-width: 720px){.app-header{height:auto;flex-wrap:wrap;padding:.6rem 1rem;gap:.5rem}.header-level-tabs{order:3;width:100%;justify-content:center}.header-logo-btn,.header-nav{flex-shrink:0}.top-indicators .indicator-dot{width:32px;height:32px}.top-indicators .indicator-dot:after{width:7px;height:7px}}.practice-textarea.is-correct{border-color:var(--color-success)!important;box-shadow:0 0 12px var(--color-success-border)!important;background:#22c35d12!important}.practice-textarea.is-incorrect{border-color:var(--color-danger)!important;box-shadow:0 0 12px var(--color-danger-border)!important;background:#df204012!important}.diff-label{font-size:.8rem;font-weight:700;text-transform:uppercase;color:var(--color-danger);letter-spacing:.05em;display:block;margin-top:.25rem}.auth-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#0000008c;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);display:flex;justify-content:center;align-items:center;z-index:1000;padding:1rem}.auth-modal{position:relative;width:100%;max-width:440px;padding:24px;border-radius:var(--border-radius);animation:modalScaleUp var(--transition-normal)}@keyframes modalScaleUp{0%{transform:scale(.95);opacity:0}to{transform:scale(1);opacity:1}}.auth-close-btn{position:absolute;top:16px;right:16px;background:none;border:none;color:var(--text-muted);font-size:24px;font-weight:300;cursor:pointer;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:50%;transition:all var(--transition-fast)}.auth-close-btn:hover{background-color:#ffffff14;color:var(--text-main)}.auth-tabs{display:flex;margin-bottom:24px;border-bottom:1px solid var(--glass-border);gap:8px}.auth-tab-btn{flex:1;background:none;border:none;border-bottom:2px solid transparent;color:var(--text-muted);font-family:inherit;font-size:16px;font-weight:600;padding:12px 8px;cursor:pointer;transition:all var(--transition-fast);min-height:44px}.auth-tab-btn:hover{color:var(--text-main)}.auth-tab-btn.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.auth-form{display:flex;flex-direction:column;gap:16px}.auth-field{display:flex;flex-direction:column;gap:6px}.auth-field label{font-size:14px;font-weight:600;color:var(--text-muted)}.auth-field input{padding:12px 14px;background-color:#00000040;border:1px solid var(--glass-border);border-radius:var(--border-radius-sm);color:var(--text-main);font-family:inherit;font-size:16px;transition:all var(--transition-fast);width:100%}.auth-field input:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-glow)}.auth-submit-btn{margin-top:8px;padding:12px 24px;background-color:var(--color-primary);color:#fff;border:none;border-radius:var(--border-radius-sm);font-size:16px;font-weight:600;cursor:pointer;transition:all var(--transition-fast);min-height:44px;display:flex;align-items:center;justify-content:center}.auth-submit-btn:hover:not(:disabled){background-color:var(--color-primary-hover);box-shadow:0 0 12px var(--color-primary-glow)}.auth-submit-btn:disabled{opacity:.6;cursor:not-allowed}.auth-alert{padding:12px 16px;border-radius:var(--border-radius-sm);font-size:14px;line-height:1.4;border:1px solid transparent}.auth-alert.error-state{background-color:var(--color-danger-bg);border-color:var(--color-danger-border);color:var(--color-danger)}.auth-alert.success-state{background-color:var(--color-success-bg);border-color:var(--color-success-border);color:var(--color-success)}.profile-dashboard{width:100%;max-width:var(--max-width);margin:0 auto;display:flex;flex-direction:column;gap:32px;padding:16px 0}.profile-dashboard.restricted-state{align-items:center;text-align:center;padding:48px 32px;max-width:480px}.restricted-icon{font-size:48px;margin-bottom:16px}.restricted-title{font-size:28px;font-weight:600;margin-bottom:8px}.restricted-body{color:var(--text-muted);font-size:16px;margin-bottom:24px;line-height:1.5}.login-trigger-btn{min-height:44px;padding:12px 32px;font-size:16px;font-weight:600}.profile-header{display:flex;align-items:center;gap:24px;padding:24px;border-radius:var(--border-radius);position:relative}.profile-avatar{width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary) 0%,var(--bg-gradient-end) 100%);display:flex;align-items:center;justify-content:center;font-size:32px;font-weight:700;color:#fff;border:2px solid var(--glass-border);box-shadow:0 4px 12px #00000026}.profile-user-info{flex:1;display:flex;flex-direction:column;gap:4px}.profile-username{font-size:20px;font-weight:600;color:var(--text-main)}.profile-email{color:var(--text-muted);font-size:14px}.profile-joined{color:var(--text-dark);font-size:13px;margin-top:4px}.profile-joined strong{color:var(--text-muted)}.destructive-btn{background-color:transparent;border:1px solid var(--color-danger-border);color:var(--color-danger);min-height:44px;padding:8px 20px;font-size:14px;font-weight:600;border-radius:var(--border-radius-sm);cursor:pointer;transition:all var(--transition-fast)}.destructive-btn:hover{background-color:var(--color-danger-bg);border-color:var(--color-danger);box-shadow:0 0 10px #ff4b4b26}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.stat-card{display:flex;flex-direction:column;align-items:center;text-align:center;padding:24px 16px;border-radius:var(--border-radius);transition:transform var(--transition-fast),border-color var(--transition-fast)}.stat-card:hover{transform:translateY(-4px);border-color:var(--glass-border-hover)}.stat-icon{font-size:36px;margin-bottom:12px}.stat-value{font-size:28px;font-weight:700;color:var(--text-main);margin-bottom:4px}.stat-card:hover .stat-value{color:var(--color-primary)}.stat-label{font-size:14px;color:var(--text-muted);font-weight:500}.header-signin-btn,.auth-trigger-btn{background-color:var(--color-primary)!important;color:#fff!important;border-radius:var(--border-radius-sm)!important;font-weight:600!important;padding:.5rem 1.25rem!important;min-height:38px!important}.header-signin-btn:hover,.auth-trigger-btn:hover{background-color:var(--color-primary-hover)!important;box-shadow:0 0 10px var(--color-primary-glow)!important}@media (max-width: 680px){.stats-grid{grid-template-columns:1fr;gap:16px}.profile-header{flex-direction:column;text-align:center;padding:32px 24px}.profile-avatar{margin-bottom:8px}.destructive-btn{width:100%;margin-top:16px}}.sync-status-indicator{display:inline-flex;align-items:center;gap:.35rem;padding:.35rem .75rem;border-radius:var(--border-radius-sm);font-family:Outfit,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;font-size:.8rem;font-weight:600;border:1px solid transparent;transition:all var(--transition-fast);white-space:nowrap;margin-right:.5rem}.sync-status-indicator .sync-icon{font-size:.9rem;display:inline-block}@keyframes sync-spinner{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.sync-status-indicator .sync-icon.spinner{animation:sync-spinner 2s linear infinite}.sync-status-synced{background:var(--color-success-bg);color:var(--color-success);border-color:var(--color-success-border)}.sync-status-syncing{background:#894eef26;color:var(--color-primary-hover);border-color:#894eef4d}.sync-status-offline{background:#ffffff0d;color:var(--text-muted);border-color:#ffffff1a}.sync-status-offline.sync-status-pending{background:#f59f0a26;color:var(--color-warning);border-color:#f59f0a4d}.toast-notification{position:fixed;bottom:2rem;right:2rem;display:flex;align-items:center;gap:.75rem;background:#181d25d9;-webkit-backdrop-filter:var(--glass-blur);backdrop-filter:var(--glass-blur);border:1px solid var(--color-success-border);box-shadow:var(--glass-shadow);border-radius:var(--border-radius-sm);padding:.75rem 1.25rem;color:var(--text-main);z-index:1000;animation:toast-slide-in .3s cubic-bezier(.4,0,.2,1) forwards}@keyframes toast-slide-in{0%{transform:translateY(1rem);opacity:0}to{transform:translateY(0);opacity:1}}.toast-icon{font-size:1.2rem}.toast-text{font-size:.9rem;font-weight:500}.toast-close{background:none;border:none;color:var(--text-muted);font-size:1.2rem;cursor:pointer;padding:0;margin-left:.5rem;display:flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;transition:all var(--transition-fast)}.toast-close:hover{background:#ffffff1a;color:var(--text-main)}