/**
 * Login page styles
 * frontend/css/auth/login.css
 */

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

:root {
    --login-gradient-start: #2a5298;
    --login-gradient-end: #1e3c72;
    --login-gradient-mid: #234a85;
    --login-bg-light: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    --login-bg-dark: linear-gradient(135deg, #0f1419 0%, #1a1a2e 50%, #16213e 100%);
    --glass-bg-light: rgba(255, 255, 255, 0.85);
    --glass-bg-dark: rgba(45, 45, 45, 0.75);
    --glass-border-light: rgba(255, 255, 255, 0.3);
    --glass-border-dark: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] {
    --login-gradient-start: #4a7bc8;
    --login-gradient-end: #2a5298;
    --login-gradient-mid: #3a6bb8;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--login-bg-light);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
    overflow: hidden;
    transition: background 0.5s ease;
}

[data-theme="dark"] body {
    background: var(--login-bg-dark);
}

/* Animated Background Particles */
.particles-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(42, 82, 152, 0.3), transparent);
    animation: float-particle 20s infinite ease-in-out;
    opacity: 0.6;
}

[data-theme="dark"] .particle {
    background: radial-gradient(circle, rgba(74, 123, 200, 0.4), transparent);
    box-shadow: 0 0 20px rgba(74, 123, 200, 0.3);
}

/* ตำแหน่ง/ขนาดจาก CSS เท่านั้น (ไม่ใช้ JS inline style — รองรับ Content-Security-Policy style-src) */
.particle--1 { left: 8%; top: 15%; width: 4px; height: 4px; animation-delay: 0s; animation-duration: 18s; }
.particle--2 { left: 72%; top: 28%; width: 5px; height: 5px; animation-delay: 2.2s; animation-duration: 22s; }
.particle--3 { left: 35%; top: 62%; width: 3px; height: 3px; animation-delay: 5s; animation-duration: 16s; }
.particle--4 { left: 88%; top: 55%; width: 4px; height: 4px; animation-delay: 1.5s; animation-duration: 24s; }
.particle--5 { left: 22%; top: 78%; width: 5px; height: 5px; animation-delay: 3.8s; animation-duration: 20s; }
.particle--6 { left: 55%; top: 12%; width: 3px; height: 3px; animation-delay: 6.5s; animation-duration: 19s; }
.particle--7 { left: 15%; top: 45%; width: 4px; height: 4px; animation-delay: 4.1s; animation-duration: 21s; }
.particle--8 { left: 92%; top: 82%; width: 5px; height: 5px; animation-delay: 7.2s; animation-duration: 17s; }

/* ซ่อนแถบแจ้งเตือนโดยไม่ใช้ style="" (CSP) */
.login-alert--hidden {
    display: none !important;
}

@keyframes float-particle {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.3;
    }
    25% {
        transform: translate(30px, -50px) scale(1.2);
        opacity: 0.6;
    }
    50% {
        transform: translate(-20px, -80px) scale(0.8);
        opacity: 0.4;
    }
    75% {
        transform: translate(50px, -30px) scale(1.1);
        opacity: 0.5;
    }
}

/* Gradient Orbs */
.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: orb-float 15s infinite ease-in-out;
}

.orb-1 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, var(--login-gradient-start), var(--login-gradient-end));
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.orb-2 {
    width: 300px;
    height: 300px;
    background: linear-gradient(225deg, var(--login-gradient-end), var(--login-gradient-start));
    bottom: -50px;
    right: -50px;
    animation-delay: 5s;
}

.orb-3 {
    width: 250px;
    height: 250px;
    background: linear-gradient(45deg, var(--login-gradient-mid), var(--login-gradient-start));
    top: 50%;
    right: 10%;
    animation-delay: 10s;
}

@keyframes orb-float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, 30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.login-wrapper {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 420px;
    animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-container {
    background: var(--glass-bg-light);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 24px;
    box-shadow:
        0 12px 40px rgba(42, 82, 152, 0.12),
        0 0 0 1px var(--glass-border-light),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    width: 100%;
    padding: 40px 32px;
    position: relative;
    overflow: hidden;
    transition: box-shadow 0.3s ease;
}
.auth-page .login-container {
    max-width: 440px;
    padding: 36px 28px;
}

[data-theme="dark"] .login-container {
    background: var(--glass-bg-dark);
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.5),
        0 0 0 1px var(--glass-border-dark),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg,
        var(--login-gradient-start) 0%,
        var(--login-gradient-mid) 50%,
        var(--login-gradient-end) 100%);
    background-size: 200% 100%;
    animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.theme-toggle-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--glass-bg-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border-light);
    color: var(--login-gradient-start);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 20;
    box-shadow: 0 4px 15px rgba(42, 82, 152, 0.15);
}

[data-theme="dark"] .theme-toggle-btn {
    background: var(--glass-bg-dark);
    border: 1px solid var(--glass-border-dark);
    color: var(--accent-primary);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.theme-toggle-btn:hover {
    background: linear-gradient(135deg, var(--login-gradient-start), var(--login-gradient-end));
    color: #ffffff;
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 8px 25px rgba(42, 82, 152, 0.4);
}

.theme-toggle-btn:active {
    transform: rotate(180deg) scale(0.95);
}

.login-header {
    text-align: center;
    margin-bottom: 28px;
    position: relative;
    z-index: 5;
}

.logo-container {
    margin-bottom: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.logo-container img {
    max-width: 180px;
    max-height: 72px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(42, 82, 152, 0.3));
    transition: all 0.3s ease;
}

[data-theme="dark"] .logo-container img {
    filter: drop-shadow(0 4px 12px rgba(74, 123, 200, 0.5));
}

.login-header h1 {
    background: linear-gradient(135deg, var(--login-gradient-start), var(--login-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 26px;
    margin-bottom: 4px;
    font-weight: 700;
    letter-spacing: -0.5px;
    position: relative;
}

[data-theme="dark"] .login-header h1 {
    background: linear-gradient(135deg, var(--accent-primary), #6a9de8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-header p {
    color: #666666;
    font-size: 14px;
    font-weight: 400;
    letter-spacing: 0.3px;
}

[data-theme="dark"] .login-header p {
    color: var(--text-secondary);
}

.security-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    padding: 10px 20px;
    background: linear-gradient(135deg, rgba(42, 82, 152, 0.15), rgba(30, 60, 114, 0.1));
    backdrop-filter: blur(10px);
    border-radius: 25px;
    font-size: 13px;
    color: var(--login-gradient-start);
    font-weight: 600;
    border: 1px solid rgba(42, 82, 152, 0.2);
    box-shadow: 0 4px 15px rgba(42, 82, 152, 0.1);
    animation: badgeGlow 3s ease-in-out infinite;
}

[data-theme="dark"] .security-badge {
    background: linear-gradient(135deg, rgba(74, 123, 200, 0.25), rgba(42, 82, 152, 0.15));
    color: var(--accent-primary);
    border: 1px solid rgba(74, 123, 200, 0.3);
    box-shadow: 0 4px 15px rgba(74, 123, 200, 0.2);
}

@keyframes badgeGlow {
    0%, 100% {
        box-shadow: 0 4px 15px rgba(42, 82, 152, 0.1);
    }
    50% {
        box-shadow: 0 4px 20px rgba(42, 82, 152, 0.3);
    }
}

.form-group {
    margin-bottom: 20px;
    position: relative;
    z-index: 5;
}

.form-group label {
    display: block;
    margin-bottom: 12px;
    color: #1a1a1a;
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}

[data-theme="dark"] .form-group label {
    color: var(--text-primary);
}

.input-icon {
    position: relative;
    transition: transform 0.25s ease;
}

.input-icon.input-icon--focus {
    transform: scale(1.02);
}

.input-icon > i:first-of-type {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: #595959;
    font-size: 18px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
    pointer-events: none;
}

[data-theme="dark"] .input-icon > i:first-of-type {
    color: var(--text-light);
}

.input-icon:focus-within > i:first-of-type {
    color: var(--login-gradient-start);
    transform: translateY(-50%) scale(1.1);
}

[data-theme="dark"] .input-icon:focus-within > i:first-of-type {
    color: var(--accent-primary);
}

.form-group input {
    width: 100%;
    padding: 14px 18px 14px 48px;
    border: 2px solid #e0e0e0;
    border-radius: 12px;
    font-size: 15px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.9);
    color: #333333;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.form-group input.password-input {
    padding-right: 60px !important;
}

[data-theme="dark"] .form-group input {
    border: 2px solid var(--card-border);
    background: rgba(45, 45, 45, 0.8);
    color: var(--text-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.form-group input:focus {
    outline: none;
    border-color: var(--login-gradient-start);
    box-shadow:
        0 0 0 4px rgba(42, 82, 152, 0.15),
        0 8px 25px rgba(42, 82, 152, 0.2);
    transform: translateY(-2px);
    background: #ffffff;
}
.form-group input:focus-visible,
.btn-login:focus-visible,
.password-toggle:focus-visible,
.theme-toggle-btn:focus-visible {
    outline: 2px solid var(--login-gradient-start);
    outline-offset: 2px;
}

[data-theme="dark"] .form-group input:focus {
    border-color: var(--accent-primary);
    box-shadow:
        0 0 0 4px rgba(74, 123, 200, 0.25),
        0 8px 25px rgba(74, 123, 200, 0.3);
    background: rgba(45, 45, 45, 0.95);
}

.form-group input::placeholder {
    color: #737373;
    font-weight: 400;
}

[data-theme="dark"] .form-group input::placeholder {
    color: var(--text-light);
}

/* Password toggle button: 44px min touch target (Accessibility) */
.input-icon .password-toggle {
    position: absolute;
    right: 12px !important;
    left: auto !important;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: #999999;
    font-size: 18px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 15;
    user-select: none;
    -webkit-user-select: none;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    min-height: 44px;
    width: 44px;
    height: 44px;
    border-radius: 8px;
    pointer-events: auto;
    margin: 0;
    border: none;
    background: transparent;
}
.input-icon .password-toggle i {
    pointer-events: none;
}

.input-icon .password-toggle:hover {
    color: var(--login-gradient-start);
    background: rgba(42, 82, 152, 0.1);
    transform: translateY(-50%) scale(1.1);
}
.input-icon .password-toggle:hover i {
    color: inherit;
}

[data-theme="dark"] .input-icon .password-toggle {
    color: var(--text-light);
}

[data-theme="dark"] .input-icon .password-toggle:hover {
    color: var(--accent-primary);
    background: rgba(74, 123, 200, 0.15);
}

.input-icon .password-toggle:active {
    transform: translateY(-50%) scale(0.95);
}

.input-icon .password-toggle.active,
.input-icon .password-toggle.active i {
    color: var(--login-gradient-start);
}

[data-theme="dark"] .input-icon .password-toggle.active,
[data-theme="dark"] .input-icon .password-toggle.active i {
    color: var(--accent-primary);
}

.btn-login {
    width: 100%;
    padding: 14px 18px;
    background: linear-gradient(135deg, var(--login-gradient-start) 0%, var(--login-gradient-mid) 50%, var(--login-gradient-end) 100%);
    background-size: 200% 100%;
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.25s ease;
    margin-top: 8px;
    position: relative;
    overflow: hidden;
    box-shadow:
        0 8px 25px rgba(42, 82, 152, 0.4),
        0 0 0 0 rgba(42, 82, 152, 0.5);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-size: 15px;
    z-index: 5;
}

.btn-login::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.btn-login:hover:not(:disabled)::before {
    left: 100%;
}

.btn-login:hover:not(:disabled) {
    transform: translateY(-4px);
    box-shadow:
        0 12px 35px rgba(42, 82, 152, 0.5),
        0 0 0 4px rgba(42, 82, 152, 0.2);
    background-position: 100% 0;
}

.btn-login:active:not(:disabled) {
    transform: translateY(-2px);
    box-shadow:
        0 6px 20px rgba(42, 82, 152, 0.4),
        0 0 0 2px rgba(42, 82, 152, 0.3);
}

.btn-login:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-login i {
    margin-right: 8px;
    transition: transform 0.3s ease;
}

.btn-login:hover:not(:disabled) i {
    transform: translateX(3px);
}

.alert {
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 18px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideInDown 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 4px solid;
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 5;
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.alert-error {
    background: rgba(204, 51, 51, 0.15);
    color: #c33;
    border-left-color: #c33;
    box-shadow: 0 4px 15px rgba(204, 51, 51, 0.2);
}

[data-theme="dark"] .alert-error {
    background: rgba(204, 51, 51, 0.25);
    box-shadow: 0 4px 15px rgba(204, 51, 51, 0.3);
}

.alert-success {
    background: rgba(51, 204, 51, 0.15);
    color: #3c3;
    border-left-color: #3c3;
    box-shadow: 0 4px 15px rgba(51, 204, 51, 0.2);
}

[data-theme="dark"] .alert-success {
    background: rgba(51, 204, 51, 0.25);
    box-shadow: 0 4px 15px rgba(51, 204, 51, 0.3);
}

.rate-limit-info {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.2), rgba(255, 193, 7, 0.1));
    color: #856404;
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 18px;
    font-size: 13px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-left: 4px solid #ffc107;
    box-shadow: 0 4px 15px rgba(255, 193, 7, 0.2);
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 5;
}

[data-theme="dark"] .rate-limit-info {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.3), rgba(255, 193, 7, 0.15));
    color: #ffc107;
    box-shadow: 0 4px 15px rgba(255, 193, 7, 0.3);
}

.trust-indicators {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    position: relative;
    z-index: 5;
}

[data-theme="dark"] .trust-indicators {
    border-top: 1px solid var(--glass-border-dark);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #666666;
    font-size: 13px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 12px;
    text-decoration: none;
}

[data-theme="dark"] .trust-item {
    color: var(--text-secondary);
}

.trust-item:hover {
    color: var(--login-gradient-start);
    transform: translateY(-3px);
    background: rgba(42, 82, 152, 0.1);
}

[data-theme="dark"] .trust-item:hover {
    color: var(--accent-primary);
    background: rgba(74, 123, 200, 0.15);
}

.trust-item i {
    color: var(--login-gradient-start);
    font-size: 16px;
    transition: all 0.3s ease;
}

[data-theme="dark"] .trust-item i {
    color: var(--accent-primary);
}

.trust-item:hover i {
    transform: scale(1.2) rotate(5deg);
}

/* Respect user preference for reduced motion (performance + a11y) */
@media (prefers-reduced-motion: reduce) {
    .particle,
    .gradient-orb,
    .login-container::before,
    .logo-container,
    .theme-toggle-btn:hover,
    .btn-login:hover:not(:disabled) i {
        animation: none !important;
    }
    .login-wrapper {
        animation: none;
    }
    .particle {
        opacity: 0.4;
    }
    .gradient-orb {
        animation: none;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: 28px 20px;
        border-radius: 20px;
    }
    .auth-page .login-container {
        padding: 24px 20px;
    }

    .login-header h1 {
        font-size: 22px;
    }

    .logo-container img {
        max-width: 140px;
        max-height: 56px;
    }

    .form-group input {
        padding: 12px 14px 12px 44px;
        font-size: 14px;
    }
}