:root{--primary:#3a86ff;--secondary:#8338ec;--success:#38b000;--warning:#ffbe0b;--danger:#ff006e;--light:#f8f9fa;--dark:#212529;--gray:#dee2e6;--transition:all 0.3s ease;--header-height:180px;--header-padding:2rem}*{margin:0;padding:0;box-sizing:border-box;font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif}body{background-color:var(--light);color:var(--dark);min-height:100vh;display:flex;flex-direction:column;overflow-x:hidden;padding-top:var(--header-height)}header{position:fixed;top:0;left:0;width:100%;z-index:9999;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;text-align:center;box-shadow:0 8px 32px rgba(0,0,0,.15);height:var(--header-height);display:flex;flex-direction:column;justify-content:center;align-items:center}.header-content{display:flex;flex-direction:column;align-items:center}.logo{font-size:3rem;margin-bottom:.5rem;animation:float 6s ease-in-out infinite}header h1{font-size:2.5rem;font-weight:800;margin-bottom:.5rem;text-shadow:2px 2px 4px rgba(0,0,0,.1);letter-spacing:-.5px}header p{font-size:1.1rem;opacity:.9;max-width:600px;line-height:1.5;margin:0 auto}@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}main{flex:1;display:flex;flex-direction:column;align-items:center;padding:2rem 1rem;max-width:768px;margin:0 auto;width:100%}.container{width:100%;display:flex;flex-direction:column;align-items:center;gap:2rem}.timer-display{font-size:6rem;font-weight:700;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:1rem 0;transition:var(--transition);text-align:center;line-height:1}.timer-section{width:100%;display:flex;flex-direction:column;align-items:center;position:relative;padding:2rem;background-color:#fff;border-radius:16px;box-shadow:0 8px 30px rgba(0,0,0,.12)}.timer-controls{display:flex;gap:1rem;margin-top:1.5rem;flex-wrap:wrap;justify-content:center}.btn{padding:.75rem 1.5rem;border:none;border-radius:8px;font-weight:600;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:.5rem;font-size:1rem}.btn-primary{background-color:var(--primary);color:#fff}.btn-primary:hover{background-color:#2a75e6;transform:translateY(-2px);box-shadow:0 4px 8px rgba(58,134,255,.3)}.btn-secondary{background-color:#fff;color:var(--secondary);border:2px solid var(--secondary)}.btn-secondary:hover{background-color:var(--secondary);color:#fff;transform:translateY(-2px);box-shadow:0 4px 8px rgba(131,56,236,.3)}.btn-danger{background-color:var(--danger);color:#fff}.btn-danger:hover{background-color:#e0005f;transform:translateY(-2px);box-shadow:0 4px 8px rgba(255,0,110,.3)}.settings-section{width:100%;padding:2rem;background-color:#fff;border-radius:16px;box-shadow:0 8px 30px rgba(0,0,0,.12)}.settings-title{font-size:1.5rem;font-weight:700;margin-bottom:1.5rem;color:var(--dark)}.settings-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem}.settings-item{display:flex;flex-direction:column;gap:.5rem}.settings-label{font-weight:600;color:var(--dark)}.settings-input{padding:.75rem;border:2px solid var(--gray);border-radius:8px;font-size:1rem;transition:var(--transition);width:100%}.settings-input:focus{outline:0;border-color:var(--primary);box-shadow:0 0 0 3px rgba(58,134,255,.25)}.ambient-sounds{margin-top:1.5rem}.sound-options{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:.5rem}.sound-option{padding:.5rem 1rem;background-color:var(--light);border-radius:20px;cursor:pointer;transition:var(--transition);font-size:.9rem}.sound-option:hover{background-color:var(--gray)}.sound-option.active{background-color:var(--primary);color:#fff}.progress-bar{width:100%;height:8px;background-color:var(--gray);border-radius:4px;overflow:hidden;margin-top:1.5rem}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--secondary));width:0%;transition:width 1s linear}.session-info{margin-top:1rem;font-size:.9rem;color:#6c757d;text-align:center}.mode-indicator{font-size:1.5rem;font-weight:600;margin-bottom:1rem;color:var(--primary);transition:var(--transition)}footer{padding:1.5rem;text-align:center;background-color:var(--dark);color:#fff;margin-top:2rem}@media (max-width:640px){:root{--header-height:150px;--header-padding:1.5rem}header .logo{font-size:2.5rem}header h1{font-size:2rem}header p{font-size:1rem}.timer-display{font-size:4rem}.settings-grid{grid-template-columns:1fr}.settings-section,.timer-section{padding:1.5rem}}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.05)}100%{transform:scale(1)}}.pulse{animation:pulse 2s infinite}button:focus,input:focus,select:focus{outline:3px solid rgba(58,134,255,.5);outline-offset:2px}.theme-toggle{position:absolute;top:1rem;right:1rem;background:0 0;border:none;font-size:1.5rem;cursor:pointer;color:var(--dark);transition:var(--transition)}.theme-toggle:hover{transform:rotate(15deg)}body.dark-mode{background-color:#121212;color:#e0e0e0}body.dark-mode .settings-section,body.dark-mode .timer-section{background-color:#1e1e1e;box-shadow:0 8px 30px rgba(0,0,0,.3)}body.dark-mode .settings-label,body.dark-mode .settings-title{color:#e0e0e0}body.dark-mode .settings-input{background-color:#333;border-color:#444;color:#e0e0e0}body.dark-mode .sound-option{background-color:#333}body.dark-mode .sound-option:hover{background-color:#444}body.dark-mode .theme-toggle{color:#e0e0e0}