@import url("https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap");

:root {
  --bg: #121212;
  --surface: #1e1e1e;
  --surface-alt: #171717;
  --surface-soft: rgba(255,255,255,0.03);
  --primary: #ededed;
  --secondary: #a0a0a0;
  --primary-btn: #dc2626;
  --primary-hover: #a41f1f;
  --success: #22c55e;
  --warning: #facc15;
  --error: #f43f5e;
  --info: #3b82f6;
  --disabled: #5a5a5a;
  --border: #2a2a2a;
  --entry-bg: #16324a;
  --entry-text: #e6eef9;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.22);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.34);
  --container-width: min(1300px, calc(100% - 32px));
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --scrollbar-thumb: rgba(255, 255, 255, 0.22);
  --scrollbar-thumb-hover: rgba(255, 255, 255, 0.34);
  --scrollbar-track: transparent;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: "Inter", sans-serif; scrollbar-width: thin; scrollbar-color: var(--scrollbar-thumb) transparent; }
*::-webkit-scrollbar { width: 8px; height: 8px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 999px; }
*::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }
*::-webkit-scrollbar-button,*::-webkit-scrollbar-corner { display: none; width: 0; height: 0; }
html { color-scheme: dark; overflow-x: hidden; }
body { background: radial-gradient(circle at top, rgba(220, 38, 38, 0.12), transparent 28%), var(--bg); color: var(--primary); min-height: 100vh; line-height: 1.45; overflow-x: hidden; overflow-y: auto; }
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button,input,textarea,select { font: inherit; }
button { cursor: pointer; }
.main { width: var(--container-width); margin: 28px auto 0; padding-bottom: 160px; min-width: 0; }
.page-shell { width: var(--container-width); margin: 20px auto 0; min-width: 0; }
.title { color: var(--primary-btn); font-weight: 900; letter-spacing: -0.03em; }
.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-md); box-shadow: var(--shadow); }
.navbar { position: sticky; top: 16px; z-index: 40; width: var(--container-width); margin: 20px auto 0; padding: 14px 18px; background: rgba(24, 24, 24, 0.88); border: 1px solid rgba(255,255,255,0.06); border-radius: calc(var(--radius-lg) + 4px); display: flex; align-items: center; justify-content: space-between; gap: 18px; box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.navbar-brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.navbar-brand-mark { width: 42px; height: 42px; border-radius: 14px; display: grid; place-items: center; font-weight: 900; color: #fff; background: linear-gradient(135deg, #dc2626, #ef4444 55%, #7f1d1d); box-shadow: inset 0 1px 0 rgba(255,255,255,0.2); }
.navbar-brand-mark:hover { cursor: pointer; }
.navbar .title { font-size: clamp(1.45rem, 3vw, 2rem); line-height: 1; }
.navbar .title:hover { cursor: pointer; }
.navbar-subtitle { color: var(--secondary); font-size: 0.9rem; }
.navbar-right { display: flex; align-items: center; gap: 12px; }
.buttons { display: flex; flex-wrap: wrap; gap: 10px; min-width: 0; }
.buttons button,.btn-primary,.login-btn { border: none; border-radius: 999px; padding: 0.8rem 1.15rem; font-weight: 700; background: var(--primary-btn); color: #fff; transition: background-color 0.2s ease, transform 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease; }
.buttons button:hover,.btn-primary:hover,.login-btn:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 10px 24px rgba(220, 38, 38, 0.22); }
.buttons .btn-secondary { background: var(--surface-alt); border: 1px solid var(--border); color: var(--primary); }
.buttons .btn-secondary:hover { background: #242424; }
.navbar-toggle { display: none; width: 48px; height: 48px; border-radius: 14px; border: 1px solid var(--border); background: var(--surface-alt); color: var(--primary); align-items: center; justify-content: center; flex-direction: column; gap: 5px; }
.navbar-toggle span { width: 18px; height: 2px; border-radius: 999px; background: currentColor; transition: transform 0.22s ease, opacity 0.22s ease; }
.navbar-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar-toggle.is-open span:nth-child(2) { opacity: 0; }
.navbar-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-drawer-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.5); opacity: 0; pointer-events: none; transition: opacity 0.25s ease; z-index: 59; }
.nav-drawer { position: fixed; top: 0; right: 0; width: min(88vw, 360px); height: 100vh; background: linear-gradient(180deg, rgba(220,38,38,0.09), transparent 22%), #171717; border-left: 1px solid rgba(255,255,255,0.06); box-shadow: var(--shadow-lg); padding: 22px 18px 28px; transform: translateX(100%); transition: transform 0.28s ease; z-index: 60; display: flex; flex-direction: column; gap: 20px; }
.nav-drawer.open,.nav-drawer-backdrop.open { opacity: 1; pointer-events: auto; }
.nav-drawer.open { transform: translateX(0); }
.nav-drawer-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.nav-drawer-close { width: 42px; height: 42px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-alt); color: var(--primary); }
.nav-drawer .buttons { flex-direction: column; }
.nav-drawer .buttons button { width: 100%; min-height: 50px; justify-content: center; }
.loading-overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(0, 0, 0, 0.55); z-index: 9998; }
.loading-overlay.hidden { display: none; }
.loading-card { background: var(--surface); color: var(--primary); padding: 18px 22px; border-radius: var(--radius-sm); display: flex; align-items: center; gap: 12px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.loading-text { font-size: 16px; }
.spinner { width: 28px; height: 28px; border-radius: 50%; border: 3px solid rgba(255, 255, 255, 0.08); border-top-color: var(--primary-btn); animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.modal { position: fixed; inset: 0; display: none; align-items: center; justify-content: center; background: rgba(0, 0, 0, 0.65); z-index: 9999; padding: 20px; }
.modal.show { display: flex; }
.modal-content { background: var(--surface); color: var(--primary); border-radius: var(--radius-md); padding: 18px; width: min(820px, 100%); max-height: min(85vh, 760px); overflow: auto; border: 1px solid var(--border); box-shadow: var(--shadow); }
.modal-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.modal-close { background: transparent; color: var(--primary); border: none; font-size: 1.2rem; }
.modal-close:focus { outline: none; }
.modal-teacher { margin-top: 6px; color: var(--secondary); font-size: 14px; }
.modal-label { margin-top: 12px; color: var(--secondary); }
.modal-text { margin-top: 8px; white-space: normal; overflow-wrap: anywhere; }
.footer { width: var(--container-width); margin: 26px auto 18px; display: flex; justify-content: space-between; gap: 12px; color: var(--secondary); font-size: 0.9rem; }
@media (max-width: 860px) { .navbar { padding: 12px 14px; } .navbar .buttons { display: none; } .navbar-toggle { display: inline-flex; } .navbar-subtitle { display: none; } }
@media (max-width: 640px) { .main { margin-top: 18px; padding-bottom: 120px; } .navbar { width: calc(100% - 20px); top: 10px; margin-top: 10px; border-radius: 22px; } .navbar-brand-mark { width: 38px; height: 38px; border-radius: 12px; } .footer { flex-direction: column; font-size: 0.82rem; width: calc(100% - 20px); } }