/* ===== RESET & BASE ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #16161f;
    --bg-input: #1a1a25;
    --border-color: #2a2a3a;
    --border-focus: #7b2fff;
    --text-primary: #e8e8f0;
    --text-secondary: #8888a0;
    --text-muted: #55556a;
    --accent-blue: #00d4ff;
    --accent-purple: #7b2fff;
    --accent-gradient: linear-gradient(135deg, #00d4ff, #7b2fff);
    --error-bg: #2a1020;
    --error-border: #ff4080;
    --error-text: #ff6090;
    --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Consolas', 'Courier New', monospace;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

/* ===== BACKGROUND GRID ===== */
.bg-grid {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(rgba(123, 47, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(123, 47, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
}

/* ===== HEADER ===== */
header {
    position: relative;
    z-index: 10;
    padding: 24px 40px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(12px);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon svg {
    width: 42px;
    height: 42px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 3px;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== MAIN ===== */
main {
    position: relative;
    z-index: 10;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 60px 20px;
    gap: 60px;
}

/* ===== HERO SECTION ===== */
.hero-section {
    text-align: center;
    max-width: 900px;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--accent-blue);
    letter-spacing: 2px;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 12px;
}

.hero-section .description {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 680px;
    margin: 0 auto 48px;
}

/* ===== FEATURES ROW ===== */
.features-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 860px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 28px 24px;
    text-align: center;
    transition: border-color 0.3s, transform 0.3s;
}

.feature-card:hover {
    border-color: var(--accent-purple);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 14px;
}

.feature-card h3 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ===== LOGIN SECTION ===== */
.login-section {
    width: 100%;
    max-width: 460px;
}

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 40px 36px;
    box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.4),
        0 0 80px rgba(123, 47, 255, 0.06);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.login-header p {
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* ===== FORM ===== */
.input-group {
    margin-bottom: 22px;
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    pointer-events: none;
}

.input-wrapper input {
    width: 100%;
    padding: 13px 16px 13px 42px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-main);
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

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

.input-wrapper input:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(123, 47, 255, 0.15);
}

/* ===== BUTTON ===== */
.btn-login {
    width: 100%;
    padding: 14px;
    background: var(--accent-gradient);
    border: none;
    border-radius: 10px;
    color: #fff;
    font-size: 1rem;
    font-weight: 700;
    font-family: var(--font-main);
    cursor: pointer;
    transition: opacity 0.3s, transform 0.2s;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.btn-login:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-login:active {
    transform: translateY(0);
}

.btn-loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.btn-login.loading .btn-text {
    visibility: hidden;
}

.btn-login.loading .btn-loader {
    display: block;
}

@keyframes spin {
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* ===== ERROR BOX ===== */
.error-box {
    margin-top: 20px;
    padding: 16px;
    background: var(--error-bg);
    border: 1px solid var(--error-border);
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: shakeIn 0.4s ease;
}

.error-box.hidden {
    display: none;
}

.error-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
}

.error-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.error-content strong {
    color: var(--error-text);
    font-size: 0.9rem;
}

.error-content span {
    color: var(--text-muted);
    font-size: 0.82rem;
}

@keyframes shakeIn {
    0%   { transform: translateX(-10px); opacity: 0; }
    25%  { transform: translateX(8px); }
    50%  { transform: translateX(-6px); }
    75%  { transform: translateX(3px); }
    100% { transform: translateX(0); opacity: 1; }
}

/* ===== FOOTER ===== */
footer {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 28px 20px;
    border-top: 1px solid var(--border-color);
    background: rgba(10, 10, 15, 0.6);
    backdrop-filter: blur(8px);
}

footer p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.api-note {
    margin-top: 6px;
}

.api-note code {
    background: var(--bg-card);
    padding: 3px 10px;
    border-radius: 5px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-blue);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    header {
        padding: 16px 20px;
    }

    .logo-text {
        font-size: 1.2rem;
        letter-spacing: 2px;
    }

    .features-row {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    main {
        padding: 40px 16px;
        gap: 40px;
    }

    .login-card {
        padding: 28px 22px;
    }
}

@media (max-width: 480px) {
    .subtitle {
        font-size: 0.9rem;
    }

    .hero-section .description {
        font-size: 0.95rem;
    }
}