:root {
    /* ==========================================
       THEME VARIABLES - DARK (DEFAULT)
       ========================================== */
    --neon-cyan: #00f3ff;
    --neon-pink: #ff0055;
    --neon-green: #00ff9d;
    --neon-yellow: #f5e65b;
    --neon-orange: #ff9d00;

    --bg-dark: #05080a;
    --glass-bg: rgba(10, 15, 20, 0.7);
    --border-color: rgba(0, 243, 255, 0.3);
    --border-subtle: rgba(0, 243, 255, 0.2);
    --text-primary: #ffffff;
    --text-accent: #00f3ff;
    --text-muted: #888888;
    --input-bg: rgba(0, 0, 0, 0.4);
    --input-border: #333333;
    --toast-bg: rgba(10, 15, 20, 0.95);
    --matrix-opacity: 0.3;

    --font-ui: 'Rajdhani', sans-serif;
    --font-code: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
    /* ==========================================
       THEME VARIABLES - LIGHT (HIGH CONTRAST)
       ========================================== */
    --neon-cyan: #008fa8;
    --neon-pink: #c90044;
    --neon-green: #008751;
    --neon-yellow: #b58900;
    --neon-orange: #d97706;

    --bg-dark: #f1f5f9;
    --glass-bg: rgba(255, 255, 255, 0.92);
    --border-color: rgba(0, 143, 168, 0.35);
    --border-subtle: rgba(0, 143, 168, 0.2);
    --text-primary: #0f172a;
    --text-accent: #008fa8;
    --text-muted: #64748b;
    --input-bg: rgba(248, 250, 252, 0.95);
    --input-border: #cbd5e1;
    --toast-bg: rgba(255, 255, 255, 0.98);
    --matrix-opacity: 0.08;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scrollbar-width: thin;
    scrollbar-color: var(--neon-cyan) var(--bg-dark);
}

/* ==========================================
   1. CYBERPUNK CUSTOM SCROLLBARS
   ========================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
    border: 1px solid rgba(0, 243, 255, 0.08);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 243, 255, 0.28);
    border: 1px solid rgba(0, 243, 255, 0.5);
    border-radius: 2px;
    box-shadow: inset 0 0 4px rgba(0, 243, 255, 0.3);
    transition: background 0.2s, box-shadow 0.2s;
}

[data-theme="light"] ::-webkit-scrollbar-thumb {
    background: rgba(0, 143, 168, 0.35);
    border-color: rgba(0, 143, 168, 0.6);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--neon-cyan);
    box-shadow: 0 0 10px var(--neon-cyan);
}

::-webkit-scrollbar-corner {
    background: var(--bg-dark);
}

body {
    background-color: var(--bg-dark);
    font-family: var(--font-ui);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    color: var(--text-primary);
    padding: 40px 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* --- BACKGROUND --- */
#matrixCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: var(--matrix-opacity);
    pointer-events: none;
    transition: opacity 0.3s ease;
}

/* --- CONTAINER --- */
.auth-wrapper {
    width: 100%;
    max-width: 440px;
    position: relative;
    z-index: 10;
    text-align: center;
}

.top-nav-bar {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.nav-icon-link, .theme-toggle-btn {
    background: transparent;
    border: 1px solid var(--neon-cyan);
    color: var(--neon-cyan);
    padding: 6px 10px;
    cursor: pointer;
    transition: all 0.25s ease;
    font-size: 0.9rem;
    border-radius: 2px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.theme-toggle-btn {
    border-color: var(--neon-yellow);
    color: var(--neon-yellow);
}

.theme-toggle-btn:hover {
    background: var(--neon-yellow);
    color: #000;
    box-shadow: 0 0 12px var(--neon-yellow);
}

.nav-icon-link:hover {
    background: var(--neon-cyan);
    color: #000;
    box-shadow: 0 0 12px var(--neon-cyan);
}

.logo-area {
    margin-bottom: 25px;
}

.logo-area h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    text-shadow: 0 0 15px var(--neon-cyan);
    font-weight: 800;
    letter-spacing: 2px;
}

.logo-area p {
    font-family: var(--font-code);
    color: var(--neon-green);
    font-size: 0.8rem;
    letter-spacing: 2px;
}

/* --- AUTH BOX (Glass Effect) --- */
.auth-box {
    background: var(--glass-bg);
    border: 1px solid var(--border-color);
    padding: 30px;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    position: relative;
    text-align: left;
    transition: background 0.3s ease, border-color 0.3s ease;
}

.hidden {
    display: none !important;
}

.auth-box h2 {
    color: var(--neon-cyan);
    font-size: 1.2rem;
    margin-bottom: 25px;
    font-family: var(--font-code);
    text-align: left;
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 10px;
    letter-spacing: 1px;
}

/* --- INPUT FIELDS --- */
.input-group {
    position: relative;
    margin-bottom: 16px;
}

.input-group .icon {
    position: absolute;
    left: 0;
    top: 0;
    height: 45px;
    width: 45px;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--neon-cyan);
    font-size: 0.9rem;
    pointer-events: none;
    z-index: 2;
}

.input-group input {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    padding: 12px 45px 12px 45px;
    color: var(--text-primary);
    font-family: var(--font-code);
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s, background 0.3s;
    height: 45px;
}

.input-group input:focus {
    border-color: var(--neon-cyan);
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.2);
}

.password-toggle {
    position: absolute;
    right: 0;
    top: 0;
    height: 45px;
    width: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
}

.password-toggle:hover {
    color: var(--text-primary);
}

/* --- PASSWORD SECURITY PANEL --- */
.password-security-panel {
    background: var(--input-bg);
    border: 1px solid var(--border-subtle);
    border-left: 3px solid var(--neon-cyan);
    padding: 12px 14px;
    margin-bottom: 20px;
    font-family: var(--font-code);
    transition: all 0.3s ease;
}

.strength-meter-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.72rem;
    margin-bottom: 6px;
}

.strength-title {
    color: var(--text-muted);
    letter-spacing: 1px;
}

.strength-status {
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.strength-bar-bg {
    width: 100%;
    height: 6px;
    background: rgba(125, 125, 125, 0.2);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 12px;
}

.strength-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--text-muted);
    transition: width 0.35s ease, background-color 0.35s ease, box-shadow 0.35s ease;
}

/* Constraint checklist */
.constraint-grid {
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.constraint-item {
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color 0.25s ease;
}

.constraint-item i {
    font-size: 0.75rem;
    transition: transform 0.2s ease, color 0.25s ease;
}

.constraint-item.unmet {
    color: var(--text-muted);
}

.constraint-item.unmet i {
    color: var(--text-muted);
}

.constraint-item.met {
    color: var(--neon-green);
    text-shadow: 0 0 6px rgba(0, 255, 157, 0.4);
}

.constraint-item.met i {
    color: var(--neon-green);
}

/* --- CHECKBOX --- */
.options {
    text-align: left;
    margin-bottom: 20px;
}

.checkbox-container {
    display: block;
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-muted);
    user-select: none;
    font-family: var(--font-code);
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 18px;
    width: 18px;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
}

.checkbox-container:hover input ~ .checkmark {
    background-color: rgba(125, 125, 125, 0.2);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--neon-cyan);
    border-color: var(--neon-cyan);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 5px;
    top: 2px;
    width: 4px;
    height: 8px;
    border: solid #000;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* --- CYBER BUTTON --- */
.cyber-btn {
    width: 100%;
    padding: 15px;
    background: transparent;
    border: 1px solid var(--neon-cyan);
    color: var(--neon-cyan);
    font-family: var(--font-ui);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 2px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: 0.3s;
    text-transform: uppercase;
}

.cyber-btn:hover:not(:disabled) {
    background: var(--neon-cyan);
    color: #000;
    box-shadow: 0 0 25px var(--neon-cyan);
}

.cyber-btn:disabled {
    cursor: not-allowed;
    border-color: var(--input-border);
    color: var(--text-muted);
    background: transparent;
    box-shadow: none;
}

/* --- BUTTON STATE OVERRIDES --- */
.cyber-btn.btn-loading {
    border-color: var(--neon-pink) !important;
    color: var(--neon-pink) !important;
    background: rgba(255, 0, 85, 0.1) !important;
    cursor: wait !important;
    box-shadow: none !important;
}

.cyber-btn.btn-error {
    border-color: var(--neon-pink) !important;
    background: var(--neon-pink) !important;
    color: #fff !important;
    box-shadow: 0 0 15px var(--neon-pink) !important;
    cursor: not-allowed !important;
}

.cyber-btn.btn-success {
    border-color: var(--neon-green) !important;
    color: var(--neon-green) !important;
    background: rgba(0, 255, 157, 0.1) !important;
    cursor: default !important;
    box-shadow: 0 0 15px var(--neon-green) !important;
}


/* --- OAUTH FAST-TRACK AUTHENTICATION --- */
.oauth-divider {
    display: flex;
    align-items: center;
    margin: 18px 0 14px 0;
    text-align: center;
}

.oauth-divider::before,
.oauth-divider::after {
    content: "";
    flex: 1;
    border-bottom: 1px dashed var(--border-subtle);
}

.oauth-divider span {
    padding: 0 12px;
    font-size: 0.7rem;
    color: var(--text-muted);
    font-family: var(--font-code);
    letter-spacing: 2px;
}

.oauth-google-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 13px 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    text-decoration: none;
    text-transform: uppercase;
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.25s ease;
    box-sizing: border-box;
}

.oauth-google-btn i {
    font-size: 1.15rem;
    color: #4285F4;
    transition: transform 0.25s ease;
}

.oauth-google-btn:hover {
    border-color: #4285F4;
    background: rgba(66, 133, 244, 0.12);
    color: #fff;
    box-shadow: 0 0 16px rgba(66, 133, 244, 0.35);
}

.oauth-google-btn:hover i {
    transform: scale(1.15);
}

/* --- EXTRAS --- */
.switch-mode {
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-align: center;
}

.switch-mode a {
    color: var(--neon-cyan);
    text-decoration: none;
    font-weight: 700;
    margin-left: 5px;
}

.switch-mode a:hover {
    text-decoration: underline;
    text-shadow: 0 0 8px var(--neon-cyan);
}

.validation-msg {
    display: block;
    font-size: 0.7rem;
    font-family: var(--font-code);
    text-align: right;
    margin-top: 4px;
    min-height: 15px;
}

.valid input {
    border-color: var(--neon-green) !important;
}

.invalid input {
    border-color: var(--neon-pink) !important;
}

/* --- TOAST NOTIFICATIONS (LOGIN / SIGNUP) --- */
.cyber-toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 10001;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 380px;
    pointer-events: none;
}

.cyber-toast {
    pointer-events: auto;
    background: var(--toast-bg);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--neon-cyan);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
    padding: 12px 16px;
    font-family: var(--font-code);
    font-size: 0.8rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
    animation: toastSlideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    backdrop-filter: blur(6px);
}

.cyber-toast.toast-success {
    border-color: rgba(0, 255, 157, 0.4);
    border-left-color: var(--neon-green);
}
.cyber-toast.toast-success i { color: var(--neon-green); }

.cyber-toast.toast-warning {
    border-color: rgba(255, 157, 0, 0.4);
    border-left-color: var(--neon-orange);
}
.cyber-toast.toast-warning i { color: var(--neon-orange); }

.cyber-toast.toast-error {
    border-color: rgba(255, 0, 85, 0.4);
    border-left-color: var(--neon-pink);
}
.cyber-toast.toast-error i { color: var(--neon-pink); }

.cyber-toast.toast-info i { color: var(--neon-cyan); }

.cyber-toast.toast-fadeout {
    animation: toastFadeOut 0.3s ease-in forwards;
}

@keyframes toastSlideIn {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes toastFadeOut {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

@media (max-width: 480px) {
    .auth-box { padding: 20px 16px; }
    .cyber-toast-container { left: 15px; right: 15px; bottom: 15px; max-width: none; }
}