/* ============================================================
   LOGIN SCREEN — phong cách mềm mại, dịu mắt (glass + pastel)
   Giữ nguyên toàn bộ class/ID mà index.html & googleSync.js đang dùng.
   ============================================================ */
.login-screen {
    --lg-text: #1e293b;
    --lg-muted: #64748b;
    --lg-accent: #5b8def;
    --lg-accent-2: #8b7cf6;
    --lg-card: rgba(255, 255, 255, 0.72);
    --lg-card-border: rgba(255, 255, 255, 0.9);
    --lg-soft: rgba(91, 141, 239, 0.12);
    --lg-shadow: 0 20px 60px rgba(76, 99, 160, 0.14);

    position: fixed; inset: 0; z-index: 999; display: flex;
    overflow-y: auto; overflow-x: hidden;
    font-family: 'Inter', sans-serif; color: var(--lg-text);
    background: linear-gradient(135deg, #eef4ff 0%, #f4f0ff 50%, #fff1f6 100%);
}
:root[data-theme="dark"] .login-screen {
    --lg-text: #e8ecf8;
    --lg-muted: #9aa6c4;
    --lg-accent: #7aa2ff;
    --lg-accent-2: #a594ff;
    --lg-card: rgba(30, 36, 62, 0.62);
    --lg-card-border: rgba(255, 255, 255, 0.08);
    --lg-soft: rgba(122, 162, 255, 0.14);
    --lg-shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
    background: linear-gradient(135deg, #12172b 0%, #1a1d3a 55%, #241c3a 100%);
}

/* Các quầng sáng mờ trôi nhẹ phía sau */
.login-screen::before, .login-screen::after {
    content: ""; position: fixed; border-radius: 50%; filter: blur(90px);
    pointer-events: none; z-index: 0; animation: lg-float 16s ease-in-out infinite;
}
.login-screen::before { width: 520px; height: 520px; top: -140px; left: -120px; background: rgba(125, 170, 255, 0.45); }
.login-screen::after  { width: 560px; height: 560px; bottom: -180px; right: -140px; background: rgba(200, 160, 255, 0.40); animation-delay: -8s; }
:root[data-theme="dark"] .login-screen::before { background: rgba(70, 110, 220, 0.35); }
:root[data-theme="dark"] .login-screen::after  { background: rgba(130, 90, 220, 0.30); }
@keyframes lg-float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -24px) scale(1.06); }
}
@media (prefers-reduced-motion: reduce) {
    .login-screen::before, .login-screen::after { animation: none; }
}

/* ---------- Cột giới thiệu (trái) ---------- */
.login-hero {
    flex: 1.15; position: relative; z-index: 1; display: flex; flex-direction: column;
    justify-content: center; padding: 70px 64px; min-height: 100vh; background: transparent;
}

.login-hero-badge {
    display: inline-flex; align-items: center; gap: 8px; width: fit-content;
    background: var(--lg-card); border: 1px solid var(--lg-card-border);
    color: var(--lg-accent); font-size: 13px; font-weight: 600;
    padding: 8px 16px; border-radius: 999px; margin-bottom: 26px;
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 6px 20px rgba(76, 99, 160, 0.08);
}

.login-hero h1 {
    font-family: 'Inter', sans-serif; font-weight: 700; letter-spacing: -0.02em;
    font-size: clamp(30px, 3.6vw, 44px); line-height: 1.25; margin-bottom: 18px; max-width: 580px;
    color: var(--lg-text);
}
.login-hero h1 span {
    background: linear-gradient(90deg, var(--lg-accent), var(--lg-accent-2));
    -webkit-background-clip: text; background-clip: text; color: transparent;
}

.login-hero p.lead { color: var(--lg-muted); font-size: 15.5px; max-width: 520px; margin-bottom: 34px; line-height: 1.75; }

.login-feature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 600px; margin-bottom: 34px; }
.login-feature {
    display: flex; gap: 14px; align-items: flex-start; padding: 18px;
    background: var(--lg-card); border: 1px solid var(--lg-card-border); border-radius: 20px;
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 8px 28px rgba(76, 99, 160, 0.07);
    transition: transform .25s ease, box-shadow .25s ease;
}
.login-feature:hover { transform: translateY(-3px); box-shadow: 0 14px 34px rgba(76, 99, 160, 0.12); }
.login-feature i {
    font-size: 22px; color: var(--lg-accent); background: var(--lg-soft);
    padding: 10px; border-radius: 14px; flex-shrink: 0;
}
.login-feature strong { display: block; font-size: 14px; font-weight: 600; margin-bottom: 4px; color: var(--lg-text); }
.login-feature span { font-size: 12.5px; color: var(--lg-muted); line-height: 1.6; }

.login-stats-preview { display: flex; gap: 14px; flex-wrap: wrap; max-width: 600px; }
.login-stat-card {
    flex: 1; min-width: 140px; padding: 16px 18px; border-radius: 18px;
    background: var(--lg-card); border: 1px solid var(--lg-card-border);
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
}
.login-stat-card .val { font-family: 'Orbitron', sans-serif; font-size: 22px; font-weight: 700; color: var(--lg-accent); }
.login-stat-card .lbl { font-size: 12px; color: var(--lg-muted); margin-top: 5px; }
.login-stat-card .bar { margin-top: 10px; height: 6px; border-radius: 6px; background: var(--lg-soft); overflow: hidden; }
.login-stat-card .bar i { display: block; height: 100%; border-radius: 6px; background: linear-gradient(90deg, var(--lg-accent), var(--lg-accent-2)); }

.login-quote { margin-top: 32px; max-width: 540px; }
.login-quote p { font-size: 14px; color: var(--lg-muted); font-style: italic; border-left: 3px solid var(--lg-accent); padding-left: 16px; line-height: 1.75; }

/* ---------- Khung đăng nhập (phải) ---------- */
.login-panel {
    flex: 0.85; position: relative; z-index: 1; display: flex; align-items: center; justify-content: center;
    padding: 40px; min-height: 100vh; background: transparent;
}
.login-card {
    width: 100%; max-width: 420px; text-align: center; padding: 46px 38px;
    background: var(--lg-card); border: 1px solid var(--lg-card-border); border-radius: 30px;
    backdrop-filter: blur(22px); -webkit-backdrop-filter: blur(22px);
    box-shadow: var(--lg-shadow);
}
.login-card .brand-row { display: flex; align-items: center; justify-content: center; gap: 12px; margin-bottom: 30px; }
.login-card .brand-row i {
    font-size: 30px; color: #fff; padding: 12px; border-radius: 18px;
    background: linear-gradient(135deg, var(--lg-accent), var(--lg-accent-2));
    box-shadow: 0 10px 24px rgba(91, 141, 239, 0.35);
}
.login-card .brand-row span { font-family: 'Orbitron', sans-serif; font-weight: 700; font-size: 20px; letter-spacing: 1.5px; color: var(--lg-text); }

.login-card h2 { font-size: 23px; font-weight: 700; margin-bottom: 10px; color: var(--lg-text); letter-spacing: -0.01em; }
.login-card p.sub { color: var(--lg-muted); font-size: 14px; margin-bottom: 32px; line-height: 1.7; }

.btn-google-login {
    width: 100%; display: flex; align-items: center; justify-content: center; gap: 12px;
    padding: 15px; border-radius: 16px; border: 1px solid rgba(148, 163, 184, 0.35); cursor: pointer;
    background: #ffffff; color: #1e293b; font-weight: 600; font-size: 15px; font-family: inherit;
    box-shadow: 0 6px 18px rgba(76, 99, 160, 0.10);
    transition: transform .2s ease, box-shadow .2s ease;
}
:root[data-theme="dark"] .btn-google-login { background: rgba(255, 255, 255, 0.95); }
.btn-google-login:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(76, 99, 160, 0.18); }
.btn-google-login:active { transform: translateY(0) scale(0.98); }
.btn-google-login img { width: 22px; height: 22px; }

.login-status { margin-top: 18px; font-size: 13.5px; color: var(--lg-muted); min-height: 20px; font-weight: 500; }
.login-card .btn-ghost { border-radius: 12px; }

.login-footnote { margin-top: 34px; font-size: 12px; color: var(--lg-muted); opacity: .85; line-height: 1.65; }
.login-footnote a { color: var(--lg-accent); text-decoration: none; font-weight: 500; }

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
    .login-screen { flex-direction: column; }
    .login-hero { min-height: auto; padding: 46px 28px 10px; }
    .login-feature-grid { grid-template-columns: 1fr; }
    .login-panel { min-height: auto; padding: 24px 18px 44px; }
    .login-card { padding: 36px 26px; border-radius: 26px; }
}
@media (max-width: 520px) {
    .login-hero-badge { font-size: 12px; }
    .login-stats-preview { display: none; }
    .login-quote { display: none; }
}