*{box-sizing:border-box;margin:0;padding:0}:root{--color-bg:#033f63;--color-accent:#28666e;--color-soft:#7c9885;--color-light:#b5b682;--color-highlight:#fedc97;--color-white:#ffffff}body{font-family:BlinkMacSystemFont,Roboto;background-color:var(--color-bg);color:var(--color-white);height:100vh;overflow:hidden}.header{position:fixed;top:0;left:0;width:100%;height:60px;background-color:var(--color-accent);display:flex;align-items:center;justify-content:space-between;padding:0 1rem;z-index:100}.header-logo{flex:1 1}.header-logo,.main-frame{display:flex;justify-content:center}.main-frame{width:70vw;height:70vh;background-color:var(--color-light);border-radius:24px;box-shadow:0 0 30px rgba(0,0,0,.3);padding:2rem;text-align:center;transition:all .4s ease}.auth-button,.main-frame{color:var(--color-bg);align-items:center}.auth-button{position:absolute;top:50%;right:50px;transform:translateY(-50%);display:flex;gap:.5rem;background-color:var(--color-highlight);padding:.5rem 1rem;border-radius:6px;font-weight:700;cursor:pointer;text-decoration:none}.auth-button:hover{background-color:#fbd479}.main-container{position:relative;width:100vw;height:100vh;display:flex;justify-content:center;padding-top:60px;align-items:center}.study-layout{display:flex;gap:2rem;align-items:flex-start}.control-panel{gap:1rem}.control-panel,.study-section{display:flex;flex-direction:column}.study-section{align-items:center;margin-top:2rem}.webcam-box{border-radius:16px;overflow:hidden;box-shadow:0 4px 12px rgba(0,188,212,.3);width:640px;height:480px;margin-bottom:1rem}.settings-button{top:30rem}.account-button,.settings-button{position:absolute;left:7rem;font-size:1.5rem;cursor:pointer}.account-button{top:25rem}.start-button{padding:.7rem 1.5rem;background-color:var(--color-highlight);color:var(--color-bg);border:none;border-radius:12px;font-weight:700;cursor:pointer;box-shadow:0 3px 6px rgba(0,0,0,.1)}.start-button:hover{background-color:#fbd479}.status-box,.volume-box{margin-top:1rem;padding:10px 20px;border-radius:999px;font-weight:500;font-size:1rem;text-align:center;box-shadow:0 3px 6px rgba(0,0,0,.1);max-width:300px}.status-box.focused{background-color:#d0f4f7;color:#007d87}.status-box.distracted{background-color:#ffe0e0;color:#b70000}.volume-box.ok{background-color:#e3ffe3;color:#1a7f1a}.volume-box.warn{background-color:#fff3cd;color:#856404}@keyframes fadeSlideIn{0%{opacity:0;transform:translateY(-50px);filter:blur(10px)}to{opacity:1;transform:translateY(0);filter:blur(0)}}.fade-slide-in{animation:fadeSlideIn 1.5s ease-out forwards}.error-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background:rgba(0,0,0,.5);display:flex;justify-content:center;align-items:center;z-index:999}.error-modal{background:var(--color-white);color:var(--color-bg);padding:1.5rem;border-radius:6px;position:relative;max-width:90%;width:320px;box-shadow:0 4px 15px rgba(0,0,0,.3);text-align:center}.error-close{position:absolute;top:.5rem;right:.5rem;background:transparent;border:none;font-size:1.4rem;color:#e74c3c;cursor:pointer}.error-close:hover{transform:scale(1.2)}.error-message{margin-top:1rem;font-size:1rem}