/* ============ LIGHT THEME (DEFAULT) ============ */
:root,
[data-theme="light"] {
    --bg: #fcfaf6;
    --surface: #fffefb;
    --surface-alt: #f6f2e9;
    --surface-warm: #faf7ef;
    --text: #0f0c08;
    --text-secondary: #1a1510;
    --text-tertiary: #2a221a;
    --text-muted: #3d3328;
    --text-light: #4a3f33;
    --border: #c8bfae;
    --border-light: #ddd4c4;
    --border-subtle: #ede5d5;
    --accent: #1b3d6b;
    --accent-soft: #e9eff7;
    --accent-light: #c5d5ed;
    --accent-dark: #0f2442;
    --gold: #7d5e10;
    --gold-soft: #fdf5e0;
    --gold-light: #f0e0b8;
    --teal: #155e53;
    --teal-soft: #eaf6f3;
    --rose: #8b2836;
    --rose-soft: #fdf1f3;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.03);
    --shadow-sm: 0 2px 6px rgba(0,0,0,0.05);
    --shadow-md: 0 8px 28px rgba(0,0,0,0.07),0 1px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 16px 44px rgba(0,0,0,0.09),0 3px 12px rgba(0,0,0,0.05);
    --shadow-xl: 0 30px 70px rgba(0,0,0,0.14),0 6px 20px rgba(0,0,0,0.06);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.05),0 10px 32px rgba(0,0,0,0.08);
    --header-bg: rgba(255,254,251,0.88);
    --header-bg-scrolled: rgba(255,254,251,0.96);
    --card-bg: rgba(255,254,251,0.92);
    --card-border: rgba(255,254,251,0.55);
    --input-bg: rgba(248,249,252,0.6);
    --input-border: rgba(200,208,224,0.6);
    --input-focus-border: var(--accent);
    --input-focus-shadow: rgba(27,61,107,0.06);
    --btn-primary-bg: var(--accent);
    --btn-primary-text: #fff;
    --btn-primary-hover: var(--accent-dark);
    --btn-outline-bg: rgba(255,255,255,0.5);
    --btn-outline-border: rgba(200,208,224,0.5);
    --btn-outline-hover-bg: rgba(255,255,255,0.7);
    --tab-bg: rgba(240,242,248,0.7);
    --tab-active-bg: #ffffff;
    --tab-active-shadow: rgba(27,61,107,0.16);
    --tab-inactive-text: #7a7a9a;
    --validation-bg: rgba(254,242,242,0.8);
    --validation-border: rgba(239,68,68,0.2);
    --divider-gradient: linear-gradient(90deg, transparent, #d8dce8, transparent);
    --toast-bg: rgba(255,255,255,0.85);
    --toast-border: rgba(255,255,255,0.7);
    --toast-shadow: 0 12px 40px rgba(0,0,0,0.1);
    --scrollbar-thumb: #c5bcaa;
    --scrollbar-thumb-hover: #a09580;
    --theme-toggle-bg: #f0ebe0;
    --theme-toggle-hover: #e5ddd0;
    --theme-toggle-icon: #5a4a30;
    --font-serif: 'Crimson Text', 'Georgia', 'Times New Roman', serif;
    --font-sans: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-display: 'Playfair Display', 'Georgia', 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

/* ============ DARK THEME ============ */
[data-theme="dark"] {
    --bg: #1a1815;
    --surface: #1f1c18;
    --surface-alt: #252118;
    --surface-warm: #28231a;
    --text: #e8e0d2;
    --text-secondary: #d5ccbc;
    --text-tertiary: #c2b8a5;
    --text-muted: #a89880;
    --text-light: #9a8a72;
    --border: #5a4d3a;
    --border-light: #4a4030;
    --border-subtle: #3d3426;
    --accent: #6b9bd2;
    --accent-soft: #1e2d3f;
    --accent-light: #3a5a7a;
    --accent-dark: #8ab8e8;
    --gold: #c9a030;
    --gold-soft: #2a2210;
    --gold-light: #4a3a18;
    --teal: #4db8ac;
    --teal-soft: #1a2a26;
    --rose: #c4606e;
    --rose-soft: #2a1a1d;
    --shadow-xs: 0 1px 2px rgba(0,0,0,0.12);
    --shadow-sm: 0 2px 6px rgba(0,0,0,0.18);
    --shadow-md: 0 8px 28px rgba(0,0,0,0.22),0 1px 4px rgba(0,0,0,0.14);
    --shadow-lg: 0 16px 44px rgba(0,0,0,0.26),0 3px 12px rgba(0,0,0,0.16);
    --shadow-xl: 0 30px 70px rgba(0,0,0,0.34),0 6px 20px rgba(0,0,0,0.20);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.14),0 10px 32px rgba(0,0,0,0.20);
    --header-bg: rgba(31,28,24,0.88);
    --header-bg-scrolled: rgba(31,28,24,0.96);
    --card-bg: rgba(31,28,24,0.92);
    --card-border: rgba(255,254,251,0.08);
    --input-bg: rgba(40,35,28,0.6);
    --input-border: rgba(74,64,48,0.6);
    --input-focus-border: var(--accent);
    --input-focus-shadow: rgba(107,155,210,0.08);
    --btn-primary-bg: var(--accent);
    --btn-primary-text: #0f0c08;
    --btn-primary-hover: var(--accent-dark);
    --btn-outline-bg: rgba(40,35,28,0.5);
    --btn-outline-border: rgba(90,77,58,0.5);
    --btn-outline-hover-bg: rgba(50,44,34,0.7);
    --tab-bg: rgba(40,35,28,0.7);
    --tab-active-bg: #2a2520;
    --tab-active-shadow: rgba(107,155,210,0.16);
    --tab-inactive-text: #8a7a65;
    --validation-bg: rgba(60,30,35,0.8);
    --validation-border: rgba(239,68,68,0.3);
    --divider-gradient: linear-gradient(90deg, transparent, #5a4d3a, transparent);
    --toast-bg: rgba(40,35,28,0.85);
    --toast-border: rgba(90,77,58,0.5);
    --toast-shadow: 0 12px 40px rgba(0,0,0,0.4);
    --scrollbar-thumb: #4a3d30;
    --scrollbar-thumb-hover: #5a4d3a;
    --theme-toggle-bg: #2a2520;
    --theme-toggle-hover: #353028;
    --theme-toggle-icon: #d5c8a0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.4s ease, color 0.4s ease;
}
body {
    font-family: var(--font-serif);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 24px;
    position: relative;
    transition: background-color 0.4s ease, color 0.4s ease;
    letter-spacing: 0.003em;
    font-weight: 400;
}
::-webkit-scrollbar {
    width: 7px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 20px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* ============ MINI HEADER (FIXED) ============ */
.mini-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--header-bg);
    backdrop-filter: blur(22px);
    -webkit-backdrop-filter: blur(22px);
    border-bottom: 1px solid transparent;
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
    height: 66px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2.5rem;
}
.mini-header.scrolled {
    border-bottom-color: var(--border-light);
    box-shadow: var(--shadow-xs);
    background: var(--header-bg-scrolled);
}
.header-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.28rem;
    letter-spacing: -0.01em;
    font-family: var(--font-sans);
    transition: color 0.3s ease;
}
.header-logo .logo-icon {
    width: 38px;
    height: 38px;
    flex-shrink: 0;
}
.theme-toggle-btn {
    background: var(--theme-toggle-bg);
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    flex-shrink: 0;
    color: var(--theme-toggle-icon);
    position: relative;
    overflow: hidden;
}
.theme-toggle-btn:hover {
    background: var(--theme-toggle-hover);
    transform: scale(1.06);
    box-shadow: var(--shadow-sm);
}
.theme-toggle-btn:active {
    transform: scale(0.94);
    transition: transform 0.15s ease;
}
.theme-toggle-btn .icon-sun,
.theme-toggle-btn .icon-moon {
    position: absolute;
    transition: all 0.4s cubic-bezier(0.4,0,0.2,1);
}
.theme-toggle-btn .icon-sun {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}
.theme-toggle-btn .icon-moon {
    opacity: 0;
    transform: rotate(-90deg) scale(0.6);
}
[data-theme="dark"] .theme-toggle-btn .icon-sun {
    opacity: 0;
    transform: rotate(90deg) scale(0.6);
}
[data-theme="dark"] .theme-toggle-btn .icon-moon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

/* ============ MAIN WRAPPER ============ */
.auth-wrapper {
    margin-top: 90px;
    width: 100%;
    max-width: 480px;
    flex-shrink: 0;
    margin-bottom: 40px;
}

/* ============ CARD ============ */
.auth-card {
    background: var(--card-bg);
    backdrop-filter: blur(22px) saturate(170%);
    -webkit-backdrop-filter: blur(22px) saturate(170%);
    border-radius: 28px;
    box-shadow: var(--shadow-card), var(--shadow-lg);
    padding: 38px 34px 34px;
    position: relative;
    border: 1px solid var(--card-border);
    transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
    overflow: visible;
}
.auth-card:hover {
    box-shadow: var(--shadow-xl);
    border-color: var(--border-light);
}

/* ============ BRANDING ============ */
.auth-brand {
    text-align: center;
    margin-bottom: 24px;
    position: relative;
    z-index: 1;
}
.auth-brand__name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 2rem;
    color: var(--text);
    letter-spacing: -0.5px;
    line-height: 1;
    transition: color 0.4s ease;
}
.auth-brand__name .accent {
    color: var(--accent);
    font-style: italic;
}
.auth-brand__subtitle {
    font-family: var(--font-serif);
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-top: 6px;
    letter-spacing: 0.3px;
    font-style: italic;
    transition: color 0.4s ease;
}

/* ============ TAB SWITCHER ============ */
.tab-switcher {
    display: flex;
    background: var(--tab-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 9999px;
    padding: 5px;
    margin-bottom: 26px;
    position: relative;
    border: 1px solid var(--border-subtle);
    gap: 4px;
    z-index: 1;
}
.tab-switcher__bg {
    position: absolute;
    top: 5px;
    left: 5px;
    width: calc(50% - 5px);
    height: calc(100% - 10px);
    background: var(--tab-active-bg);
    border-radius: 9999px;
    box-shadow: 0 3px 16px var(--tab-active-shadow), 0 1px 4px rgba(0,0,0,0.04);
    transition: transform 0.45s cubic-bezier(0.34,1.56,0.64,1);
    z-index: 0;
}
.tab-switcher.signup-active .tab-switcher__bg {
    transform: translateX(100%);
}
.tab-btn {
    flex: 1;
    padding: 12px 18px;
    border: none;
    background: transparent;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--tab-inactive-text);
    cursor: pointer;
    border-radius: 9999px;
    position: relative;
    z-index: 1;
    transition: color 0.2s cubic-bezier(0.4,0,0.2,1);
    letter-spacing: -0.2px;
    white-space: nowrap;
}
.tab-btn.active {
    color: var(--accent-dark);
    font-weight: 700;
}
.tab-btn:hover:not(.active) {
    color: var(--text-secondary);
}

/* ============ FORM PANELS ============ */
.form-panel {
    display: none;
    animation: fadeSlideIn 0.4s cubic-bezier(0.22,1.2,0.36,1) forwards;
}
.form-panel.active {
    display: block;
}
@keyframes fadeSlideIn {
    0% { opacity: 0; transform: translateY(12px); }
    100% { opacity: 1; transform: translateY(0); }
}

/* ============ INPUTS ============ */
.input-group {
    margin-bottom: 16px;
    position: relative;
}
.input-group__label {
    display: block;
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
    letter-spacing: 0.3px;
    text-transform: uppercase;
    font-family: var(--font-sans);
    transition: color 0.2s ease;
}
.input-group__wrapper {
    position: relative;
    display: flex;
    align-items: center;
}
.input-group__icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    pointer-events: none;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.input-group__icon svg {
    width: 17px;
    height: 17px;
    stroke: var(--text-muted);
    transition: stroke 0.2s ease;
}
.input-field {
    width: 100%;
    padding: 13px 14px 13px 42px;
    border: 2px solid var(--input-border);
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--text);
    background: var(--input-bg);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    letter-spacing: -0.1px;
    outline: none;
}
.input-field::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}
.input-field:focus {
    border-color: var(--input-focus-border);
    background: var(--surface);
    box-shadow: 0 0 0 8px var(--input-focus-shadow), 0 4px 20px rgba(0,0,0,0.04);
}
.input-group:focus-within .input-group__label {
    color: var(--accent-dark);
}
.input-group:focus-within .input-group__icon svg {
    stroke: var(--accent);
}
.input-field.input-error {
    border-color: #ef4444;
    background: rgba(254,242,242,0.6);
    box-shadow: 0 0 0 6px rgba(239,68,68,0.04);
    animation: shake 0.5s ease;
}
@keyframes shake {
    0%,100% { transform: translateX(0); }
    20% { transform: translateX(-5px); }
    40% { transform: translateX(5px); }
    60% { transform: translateX(-3px); }
    80% { transform: translateX(3px); }
}

.validation-msg {
    display: none;
    align-items: center;
    gap: 6px;
    margin-top: 6px;
    font-size: 0.73rem;
    font-weight: 600;
    color: #dc2626;
    letter-spacing: -0.1px;
    animation: fadeSlideIn 0.25s ease;
    padding: 7px 12px;
    background: var(--validation-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 8px;
    border: 1px solid var(--validation-border);
    font-family: var(--font-sans);
}
.validation-msg.show {
    display: flex;
}
.validation-msg svg {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    stroke: #dc2626;
}

/* Password toggle */
.password-toggle {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: 7px;
    z-index: 2;
    border-radius: 50%;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.password-toggle:hover {
    background: rgba(108,92,231,0.07);
}
.password-toggle svg {
    width: 19px;
    height: 19px;
    stroke: var(--text-muted);
    transition: stroke 0.2s ease;
}
.password-toggle:hover svg {
    stroke: var(--accent);
}

/* ============ BUTTONS ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 26px;
    border: none;
    border-radius: 9999px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
    letter-spacing: -0.2px;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    white-space: nowrap;
    width: 100%;
}
.btn-primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    box-shadow: 0 8px 28px rgba(27,61,107,0.3);
    font-weight: 700;
}
[data-theme="dark"] .btn-primary {
    box-shadow: 0 8px 28px rgba(107,155,210,0.3);
}
.btn-primary:hover {
    background: var(--btn-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 36px rgba(15,36,66,0.35);
}
.btn-primary:active {
    transform: translateY(0) scale(0.97);
    box-shadow: 0 3px 14px rgba(27,61,107,0.22);
    transition: all 0.1s ease;
}
.btn-outline {
    background: var(--btn-outline-bg);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    color: var(--accent-dark);
    border: 2px solid var(--btn-outline-border);
    box-shadow: none;
    font-weight: 600;
}
.btn-outline:hover {
    border-color: var(--accent-light);
    background: var(--btn-outline-hover-bg);
    box-shadow: 0 6px 20px rgba(0,0,0,0.06);
}
.btn-sm {
    padding: 11px 18px;
    font-size: 0.8rem;
    width: 100%;
    border-radius: 9999px;
}
.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: none;
    filter: grayscale(10%);
}
.btn-spinner {
    width: 19px;
    height: 19px;
    border: 2.5px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    display: none;
}
.btn.loading .btn-spinner {
    display: block;
}
.btn.loading .btn-text {
    display: none;
}
.btn.loading {
    pointer-events: none;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============ DIVIDER ============ */
.divider {
    display: flex;
    align-items: center;
    gap: 14px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    font-family: var(--font-sans);
}
.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--divider-gradient);
    border-radius: 1px;
}

/* ============ SOCIAL BUTTONS ============ */
.social-btns {
    display: flex;
    gap: 10px;
}
.social-btn {
    flex: 1;
    padding: 12px 10px;
    border: 2px solid var(--btn-outline-border);
    border-radius: 9999px;
    background: var(--btn-outline-bg);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}
.social-btn:hover {
    border-color: var(--border);
    background: var(--btn-outline-hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.04);
}
.social-btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* ============ TOAST (FIXED BELOW HEADER) ============ */
.toast {
    position: fixed;
    top: 80px;
    right: 22px;
    z-index: 1001;
    background: var(--toast-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 15px 20px;
    border-radius: 12px;
    box-shadow: var(--toast-shadow);
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.82rem;
    transform: translateX(130%);
    transition: transform 0.45s cubic-bezier(0.34,1.56,0.64,1);
    border: 1px solid var(--toast-border);
    display: flex;
    align-items: center;
    gap: 10px;
    max-width: 420px;
    color: var(--text);
}
.toast.show {
    transform: translateX(0);
}
.toast.success { border-left: 4px solid #10b981; }
.toast.error { border-left: 4px solid #ef4444; }
.toast.info { border-left: 4px solid var(--accent); }
.toast__icon { flex-shrink: 0; display: flex; align-items: center; }

/* ============ RESPONSIVE ============ */
@media (max-width: 540px) {
    body {
        padding: 14px;
        padding-top: 80px;
    }
    .auth-card {
        padding: 26px 18px 22px;
        border-radius: 24px;
    }
    .tab-btn { font-size: 0.82rem; padding: 10px 12px; }
    .input-field { padding: 11px 11px 11px 38px; font-size: 0.83rem; }
    .input-group__icon { left: 12px; }
    .input-group__icon svg { width: 15px; height: 15px; }
    .social-btns { flex-direction: column; gap: 7px; }
    .btn { padding: 12px 18px; font-size: 0.84rem; }
    .auth-brand__name { font-size: 1.6rem; }
    .mini-header { padding: 0 1.2rem; }
    .toast {
        top: 70px; right: 10px; left: 10px;
        max-width: calc(100vw - 20px);
        font-size: 0.75rem; padding: 12px 16px;
    }
}