* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ===== Theme Variables ===== */

/* Light theme (A) — default */
:root, [data-theme="light"] {
    --bg: #FAF6F0;
    --card-bg: #FFFFFF;
    --card-border: transparent;
    --card-shadow: 0 2px 12px rgba(0,0,0,0.06);
    --tab-bg: #F0ECE4;
    --input-bg: #F7F3ED;
    --input-border: #E5E0D8;
    --input-focus-border: #DA7756;
    --accent: #DA7756;
    --accent-hover: #C96A4A;
    --text-primary: #2D2D2D;
    --text-secondary: #8A8A8A;
    --text-muted: #B0A898;
    --error: #D94452;
    --success: #2F9461;
    --logo-text: #2D2D2D;
    --logo-node: #2D2D2D;
    --toast-bg: #FFFFFF;
    --toast-border: #DA7756;
    --toast-text: #2D2D2D;
}

/* Dark theme (B) */
[data-theme="dark"] {
    --bg: #1A1A1A;
    --card-bg: #242424;
    --card-border: #333333;
    --card-shadow: none;
    --tab-bg: #1A1A1A;
    --input-bg: #1A1A1A;
    --input-border: #333333;
    --input-focus-border: #DA7756;
    --accent: #DA7756;
    --accent-hover: #E8845E;
    --text-primary: #F0F0F0;
    --text-secondary: #777777;
    --text-muted: #555555;
    --error: #E55B68;
    --success: #48bb78;
    --logo-text: #F0F0F0;
    --logo-node: #F0F0F0;
    --toast-bg: #242424;
    --toast-border: #DA7756;
    --toast-text: #F0F0F0;
}

/* ===== Base ===== */

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    transition: background 0.3s, color 0.3s;
}

.auth-wrapper {
    width: 100%;
    max-width: 420px;
}

/* ===== Theme Toggle ===== */

.theme-toggle {
    position: fixed;
    top: 1.2rem;
    right: 1.2rem;
    background: var(--card-bg);
    border: 1px solid var(--input-border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background 0.3s, border-color 0.3s;
    z-index: 100;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: var(--text-secondary);
    transition: fill 0.3s;
}

.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ===== Branding ===== */

.branding {
    text-align: center;
    margin-bottom: 1.5rem;
}

.branding .logo-svg {
    display: block;
    margin: 0 auto;
}

.branding .logo-svg .logo-text {
    fill: var(--logo-text);
    transition: fill 0.3s;
}

.branding .logo-svg .logo-accent {
    fill: var(--accent);
}

.branding .logo-svg .logo-node {
    fill: var(--logo-node);
    transition: fill 0.3s;
}

.branding .logo-svg .logo-branch {
    stroke: var(--accent);
}

.branding .logo-svg .logo-branch-fill {
    fill: var(--accent);
}

.branding p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.25rem;
}

/* ===== Auth Card ===== */

.auth-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
    transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
}

/* ===== Tabs ===== */

.tabs {
    display: flex;
    margin-bottom: 1.5rem;
    background: var(--tab-bg);
    border-radius: 8px;
    padding: 4px;
    transition: background 0.3s;
}

.tab-btn {
    flex: 1;
    padding: 0.6rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 6px;
    transition: background 0.2s, color 0.2s;
}

.tab-btn.active {
    background: var(--accent);
    color: #fff;
}

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

/* ===== Forms ===== */

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.35rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.7rem 0.9rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s, background 0.3s, color 0.3s;
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group input:focus {
    border-color: var(--input-focus-border);
}

.form-group input.invalid {
    border-color: var(--error);
}

.form-group .error-msg {
    color: var(--error);
    font-size: 0.78rem;
    margin-top: 0.3rem;
    display: none;
}

.form-group .error-msg.visible {
    display: block;
}

/* ===== Submit Button ===== */

.submit-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 0.5rem;
    transition: background 0.2s, opacity 0.2s;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-btn:hover {
    background: var(--accent-hover);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

.submit-btn.loading .btn-text {
    opacity: 0.7;
}

.submit-btn.loading .btn-spinner {
    display: inline-block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===== Forgot Password Link ===== */

.forgot-link {
    display: block;
    text-align: right;
    margin-top: -0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
    color: var(--accent);
    text-decoration: none;
    cursor: pointer;
}

.forgot-link:hover {
    text-decoration: underline;
}

/* ===== Auth Views (forgot, reset, verify, success) ===== */

.auth-view {
    text-align: center;
}

.auth-view .form-group {
    text-align: left;
}

.form-title {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.form-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.auth-back {
    display: inline-block;
    margin-top: 1.25rem;
    font-size: 0.85rem;
    color: var(--accent);
    text-decoration: none;
}

.auth-back:hover {
    text-decoration: underline;
}

/* ===== Status Icons (verify/success) ===== */

.status-icon {
    margin: 0.5rem auto 1rem;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.status-icon.verifying {
    color: var(--accent);
    animation: pulse 1.5s ease-in-out infinite;
}

.status-icon.success {
    color: var(--success);
}

.status-icon.error {
    color: var(--error);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* ===== Footer ===== */

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--accent);
    text-decoration: none;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ===== Toast ===== */

.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--toast-bg);
    color: var(--toast-text);
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--toast-border);
    font-size: 0.9rem;
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s, color 0.3s;
    z-index: 1000;
    pointer-events: none;
    max-width: 90%;
    text-align: center;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ===== Responsive ===== */

@media (max-width: 480px) {
    .auth-card {
        padding: 1.5rem;
    }

    .theme-toggle {
        top: 0.8rem;
        right: 0.8rem;
    }
}