/* ============================================================
   TCT English — Auth Page (Stitch Redesign v2)
   Premium dark/light split layout with glassmorphism
   ============================================================ */
@import url('tct-learning-ui.css');

/* ---- Design Tokens (Auth-specific) ---- */
:root {
    --auth-dark-bg: #0f172a;
    --auth-dark-bg-end: #1e293b;
    --auth-accent-glow: rgba(99, 102, 241, 0.35);
    --auth-glass-bg: rgba(255, 255, 255, 0.06);
    --auth-glass-border: rgba(255, 255, 255, 0.12);
    --auth-glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    --auth-card-shadow: 0 4px 24px rgba(66, 85, 255, 0.08), 0 1px 3px rgba(0,0,0,0.04);
    --auth-input-focus-ring: rgba(66, 85, 255, 0.18);
    --auth-gradient-btn: linear-gradient(135deg, #4255ff 0%, #6366f1 50%, #818cf8 100%);
    --auth-gradient-btn-hover: linear-gradient(135deg, #3b4de0 0%, #5558e0 50%, #7275e8 100%);
}

/* ---- Base Reset ---- */
body.auth-page {
    background-color: var(--auth-dark-bg);
    font-family: var(--tct-font-family);
    color: var(--tct-text-main);
    min-height: 100vh;
    display: flex;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

.auth-split-container {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

/* ============================================================
   LEFT COLUMN — Dark Gradient Hero
   ============================================================ */
.auth-col-left {
    flex: 1.15;
    background: linear-gradient(155deg, var(--auth-dark-bg) 0%, var(--auth-dark-bg-end) 60%, #0f1729 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 60px 48px;
    position: relative;
    overflow: hidden;
}

/* Ambient glow blobs */
.auth-col-left::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.18) 0%, transparent 70%);
    top: -80px;
    left: -120px;
    border-radius: 50%;
    animation: auth-glow-drift 12s ease-in-out infinite alternate;
    pointer-events: none;
}

.auth-col-left::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
    bottom: -60px;
    right: -60px;
    border-radius: 50%;
    animation: auth-glow-drift 14s ease-in-out infinite alternate-reverse;
    pointer-events: none;
}

@keyframes auth-glow-drift {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, 20px) scale(1.08); }
}

/* Dot grid pattern overlay */
.auth-decoration {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 32px 32px;
    z-index: 1;
    pointer-events: none;
}

/* Floating glass shapes */
.auth-floating-shapes {
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    overflow: hidden;
}

.auth-shape {
    position: absolute;
    border-radius: 50%;
    border: 1px solid var(--auth-glass-border);
    background: var(--auth-glass-bg);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.auth-shape--1 {
    width: 120px;
    height: 120px;
    top: 12%;
    left: 8%;
    animation: auth-float-1 16s ease-in-out infinite;
}

.auth-shape--2 {
    width: 80px;
    height: 80px;
    top: 55%;
    right: 12%;
    border-radius: 24px;
    animation: auth-float-2 13s ease-in-out infinite;
}

.auth-shape--3 {
    width: 56px;
    height: 56px;
    bottom: 18%;
    left: 20%;
    border-radius: 16px;
    animation: auth-float-3 18s ease-in-out infinite;
}

.auth-shape--4 {
    width: 160px;
    height: 160px;
    top: 30%;
    right: 5%;
    opacity: 0.4;
    animation: auth-float-4 20s ease-in-out infinite;
}

.auth-shape--5 {
    width: 40px;
    height: 40px;
    top: 72%;
    left: 50%;
    border-radius: 12px;
    animation: auth-float-1 10s ease-in-out infinite reverse;
}

@keyframes auth-float-1 {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(8deg); }
}
@keyframes auth-float-2 {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(15px) rotate(-6deg); }
}
@keyframes auth-float-3 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(10px, -12px) rotate(12deg); }
}
@keyframes auth-float-4 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(-15px, 10px) scale(1.05); }
}

/* Brand content */
.auth-brand-content {
    max-width: 440px;
    text-align: center;
    z-index: 3;
    position: relative;
}

.auth-brand-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--auth-gradient-btn);
    border-radius: 18px;
    margin-bottom: 28px;
    box-shadow: 0 4px 20px rgba(66, 85, 255, 0.35);
}

.auth-brand-logo i {
    font-size: 28px;
    color: #fff;
}

.auth-brand-title {
    font-weight: 800;
    font-size: 2.75rem;
    color: #ffffff;
    margin-bottom: 16px;
    letter-spacing: -0.03em;
    line-height: 1.15;
}

.auth-brand-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.7;
    margin-bottom: 40px;
}

/* Feature glass cards */
.auth-features {
    display: flex;
    gap: 14px;
    z-index: 3;
    position: relative;
    flex-wrap: wrap;
    justify-content: center;
}

.auth-feature-card {
    background: var(--auth-glass-bg);
    border: 1px solid var(--auth-glass-border);
    border-radius: 14px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.auth-feature-card:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 255, 255, 0.22);
}

.auth-feature-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.auth-feature-icon--vocab {
    background: rgba(99, 102, 241, 0.25);
    color: #a5b4fc;
}

.auth-feature-icon--speaking {
    background: rgba(56, 189, 248, 0.2);
    color: #7dd3fc;
}

.auth-feature-icon--quiz {
    background: rgba(251, 191, 36, 0.2);
    color: #fcd34d;
}

.auth-feature-label {
    font-size: 13px;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
    white-space: nowrap;
}

/* ============================================================
   RIGHT COLUMN — Clean White Form Area
   ============================================================ */
.auth-col-right {
    flex: 0.85;
    background-color: #f8fafc;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 48px 40px;
    position: relative;
}

/* Close button */
.auth-close-btn {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 40px;
    height: 40px;
    font-size: 18px;
    color: var(--tct-text-muted);
    cursor: pointer;
    transition: all 0.25s ease;
    background: rgba(0,0,0,0.03);
    border: 1px solid transparent;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.auth-close-btn:hover {
    color: var(--tct-text-main);
    background-color: rgba(0,0,0,0.06);
    border-color: var(--tct-border-input);
    transform: rotate(90deg);
}

/* Auth card */
.auth-card {
    background-color: var(--tct-white);
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 24px;
    box-shadow: var(--auth-card-shadow);
    width: 100%;
    max-width: 440px;
    padding: 40px 36px;
    animation: auth-card-enter 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes auth-card-enter {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ---- Tabs ---- */
.auth-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 28px;
    background: #f1f5f9;
    border-radius: 14px;
    padding: 4px;
    border: none;
}

.auth-tab-btn {
    flex: 1;
    background: transparent;
    border: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--tct-text-muted);
    cursor: pointer;
    padding: 10px 16px;
    border-radius: 11px;
    transition: all 0.3s ease;
    font-family: inherit;
    position: relative;
}

.auth-tab-btn.active {
    color: var(--tct-primary-blue);
    background: var(--tct-white);
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    border-bottom: none;
}

.auth-tab-btn:not(.active):hover {
    color: var(--tct-text-main);
}

/* ---- Social Buttons ---- */
.auth-social-btns {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.auth-btn-social {
    flex: 1;
    padding: 11px 16px;
    border: 1px solid var(--tct-border-input);
    border-radius: 14px;
    background: var(--tct-white);
    color: var(--tct-text-main);
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.25s ease;
    font-size: 13.5px;
    font-family: inherit;
}

.auth-btn-social:hover {
    background-color: #f8fafc;
    border-color: #cbd5e1;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transform: translateY(-1px);
}

/* ---- Separator ---- */
.auth-separator {
    display: flex;
    align-items: center;
    text-align: center;
    color: var(--tct-text-muted);
    font-size: 12px;
    font-weight: 500;
    text-transform: uppercase;
    margin: 20px 0;
    letter-spacing: 0.04em;
}

.auth-separator::before,
.auth-separator::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--tct-border-input);
}

.auth-separator::before { margin-right: 14px; }
.auth-separator::after { margin-left: 14px; }

/* ---- Form Fields ---- */
.auth-form-group {
    margin-bottom: 18px;
    position: relative;
}

.auth-form-label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 13px;
    color: var(--tct-text-main);
    letter-spacing: 0.01em;
}

.auth-form-input {
    width: 100%;
    padding: 12px 16px;
    background-color: #f8fafc;
    border: 1.5px solid var(--tct-border-input);
    border-radius: 14px;
    font-size: 14px;
    color: var(--tct-text-main);
    transition: all 0.25s ease;
    font-family: inherit;
    box-sizing: border-box;
}

.auth-form-input::placeholder {
    color: #94a3b8;
}

.auth-form-input:focus {
    background-color: var(--tct-white);
    border-color: var(--tct-primary-blue);
    outline: none;
    box-shadow: 0 0 0 4px var(--auth-input-focus-ring);
}

/* Password wrapper */
.auth-password-wrap {
    position: relative;
}

.auth-password-wrap .auth-form-input {
    padding-right: 44px;
}

.auth-toggle-password {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--tct-text-muted);
    cursor: pointer;
    padding: 4px;
    font-size: 15px;
    transition: color 0.2s;
}

.auth-toggle-password:hover {
    color: var(--tct-primary-blue);
}

/* ---- Submit Button ---- */
.auth-btn-submit {
    width: 100%;
    padding: 13px;
    background: var(--auth-gradient-btn);
    color: var(--tct-white);
    border: none;
    border-radius: 14px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 6px;
    font-family: inherit;
    letter-spacing: 0.01em;
    position: relative;
    overflow: hidden;
}

.auth-btn-submit::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.auth-btn-submit:hover {
    background: var(--auth-gradient-btn-hover);
    box-shadow: 0 4px 16px rgba(66, 85, 255, 0.35);
    transform: translateY(-1px);
}

.auth-btn-submit:hover::after {
    transform: translateX(100%);
}

.auth-btn-submit:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(66, 85, 255, 0.25);
}

/* ---- Footer / Links ---- */
.auth-form-footer {
    margin-top: 22px;
    text-align: center;
    font-size: 13.5px;
    color: var(--tct-text-muted);
}

.auth-link {
    color: var(--tct-primary-blue);
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    font-family: inherit;
    font-size: inherit;
    transition: color 0.2s;
}

.auth-link:hover {
    color: var(--tct-primary-blue-hover);
    text-decoration: underline;
}

.auth-forgot-pass {
    text-align: right;
    display: block;
    font-size: 12.5px;
    color: var(--tct-text-muted);
    font-weight: 500;
    margin-top: 6px;
    text-decoration: none;
    transition: color 0.2s;
}

.auth-forgot-pass:hover {
    color: var(--tct-primary-blue);
}

/* ---- Checkbox ---- */
.auth-checkbox-wrap {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 20px;
    font-size: 12.5px;
    color: var(--tct-text-muted);
    line-height: 1.5;
}

.auth-checkbox-wrap input[type="checkbox"] {
    margin-top: 2px;
    accent-color: var(--tct-primary-blue);
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* ---- Error / Success Messages ---- */
.auth-error-msg {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 12px;
    padding: 12px 16px;
    color: #dc2626;
    font-size: 13.5px;
    font-weight: 500;
    text-align: center;
    margin-bottom: 16px;
    animation: auth-shake 0.4s ease;
}

@keyframes auth-shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-4px); }
    80% { transform: translateX(4px); }
}

/* ---- Blocked Alert ---- */
.auth-blocked-alert {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 14px;
    padding: 16px;
    margin-bottom: 16px;
    animation: auth-card-enter 0.4s ease;
}

.auth-blocked-alert .blocked-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
}

.auth-blocked-alert .blocked-header i {
    color: #dc2626;
    font-size: 18px;
}

.auth-blocked-alert .blocked-header strong {
    color: #dc2626;
    font-size: 14px;
}

.auth-blocked-alert p {
    color: var(--tct-text-main);
    font-size: 13px;
    margin: 0 0 4px 0;
}

.auth-blocked-alert .auth-btn-appeal {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: var(--auth-gradient-btn);
    color: #fff;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 13px;
    margin-top: 8px;
    transition: all 0.25s ease;
}

.auth-blocked-alert .auth-btn-appeal:hover {
    box-shadow: 0 4px 12px rgba(66, 85, 255, 0.3);
    transform: translateY(-1px);
}

/* ============================================================
   LOADER OVERLAY
   ============================================================ */
#loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(155deg, var(--auth-dark-bg) 0%, var(--auth-dark-bg-end) 100%);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.35s ease;
}

#loader-overlay.active {
    visibility: visible;
    opacity: 1;
}

.loader-brand {
    font-size: 36px;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 32px;
    letter-spacing: -0.03em;
}

.loader-tip-card {
    background: var(--auth-glass-bg);
    border: 1px solid var(--auth-glass-border);
    border-radius: 20px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 28px 32px;
    text-align: center;
    max-width: 340px;
    box-shadow: var(--auth-glass-shadow);
}

.loader-tip-icon {
    font-size: 40px;
    color: var(--tct-yellow-accent);
    margin-bottom: 16px;
}

.loader-tip-title {
    color: rgba(255, 255, 255, 0.85);
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.loader-tip-content {
    color: rgba(255, 255, 255, 0.5);
    line-height: 1.6;
    font-size: 14px;
}

.loading-bar-wrap {
    width: 240px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 999px;
    margin-top: 40px;
    overflow: hidden;
}

.loading-fill {
    height: 100%;
    background: var(--auth-gradient-btn);
    width: 0%;
    border-radius: 999px;
    transition: width 0.1s linear;
}

/* ============================================================
   RESPONSIVE — Mobile / Tablet
   ============================================================ */
@media (max-width: 960px) {
    .auth-split-container {
        flex-direction: column;
    }

    .auth-col-left {
        flex: none;
        padding: 40px 24px 32px;
        min-height: auto;
    }

    .auth-brand-title {
        font-size: 2rem;
    }

    .auth-brand-subtitle {
        font-size: 0.95rem;
        margin-bottom: 24px;
    }

    .auth-features {
        gap: 8px;
    }

    .auth-feature-card {
        padding: 10px 14px;
    }

    .auth-feature-label {
        font-size: 11.5px;
    }

    .auth-col-right {
        flex: 1;
        padding: 24px 16px 40px;
    }

    .auth-card {
        padding: 28px 22px;
        border-radius: 20px;
    }

    .auth-close-btn {
        top: 12px;
        right: 12px;
    }

    .auth-social-btns {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .auth-col-left {
        padding: 28px 16px 24px;
    }

    .auth-brand-title {
        font-size: 1.6rem;
    }

    .auth-features {
        flex-direction: column;
        align-items: center;
    }

    .auth-card {
        padding: 24px 18px;
    }
}