/* ==========================================================================
   CSS Design Tokens & Core Variables
   ========================================================================== */
:root {
    --bg-main: #0b0f19;             /* Cyber Slate Black */
    --card-bg: rgba(15, 23, 42, 0.65); /* Glassmorphic Slate 900 */
    --border-color: rgba(59, 130, 246, 0.2); /* Semi-transparent blue */
    --border-active: rgba(96, 165, 250, 0.8); /* Glowing active blue */
    
    --accent-color: #3b82f6;        /* Royal Electric Blue */
    --accent-glow: #60a5fa;         /* Light blue glow */
    --accent-glow-bg: rgba(59, 130, 246, 0.15);
    
    --text-primary: #f8fafc;        /* Slate 50 */
    --text-secondary: #94a3b8;      /* Slate 400 */
    --text-muted: #64748b;          /* Slate 500 */
    
    --success-color: #10b981;       /* Emerald Green */
    --success-bg: rgba(16, 185, 129, 0.1);
    --error-color: #ef4444;         /* Cyber Red */
    --error-bg: rgba(239, 68, 68, 0.1);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --font-mono: 'Share Tech Mono', monospace;
    
    --transition-normal: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease-in-out;
}

/* ==========================================================================
   Base resets & Grid Background
   ========================================================================== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

/* Animated Cyber Grid */
.cyber-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background-image: 
        linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    transform: perspective(500px) rotateX(60deg) translateY(-30%);
    animation: grid-scroll 24s linear infinite;
    z-index: 1;
    pointer-events: none;
}

@keyframes grid-scroll {
    0% {
        transform: perspective(500px) rotateX(60deg) translateY(-50%);
    }
    100% {
        transform: perspective(500px) rotateX(60deg) translateY(0%);
    }
}

/* Glowing Background Orb */
.glow-effect {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, rgba(37, 99, 235, 0) 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    pointer-events: none;
}

/* ==========================================================================
   Card Styling
   ========================================================================== */
.login-container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 440px;
    padding: 20px;
}

.login-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 35px 30px;
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5), 
                inset 0 1px 0 rgba(255, 255, 255, 0.1),
                0 0 30px rgba(37, 99, 235, 0.05);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: var(--transition-normal);
}

.login-card:hover {
    border-color: rgba(59, 130, 246, 0.35);
    box-shadow: 0 25px 45px -12px rgba(0, 0, 0, 0.6), 
                inset 0 1px 0 rgba(255, 255, 255, 0.15),
                0 0 40px rgba(37, 99, 235, 0.1);
}

/* Header */
.card-header {
    text-align: center;
    margin-bottom: 25px;
}

.shield-icon {
    width: 60px;
    height: 60px;
    background-color: var(--accent-glow-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    color: var(--accent-glow);
    margin: 0 auto 15px auto;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
    animation: pulse-glow 2.5s infinite;
}

@keyframes pulse-glow {
    0% {
        box-shadow: 0 0 0 0px rgba(59, 130, 246, 0.4);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(59, 130, 246, 0);
    }
    100% {
        box-shadow: 0 0 0 0px rgba(59, 130, 246, 0);
    }
}

.card-header h1 {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 800;
    letter-spacing: 2px;
    color: #ffffff;
    margin-bottom: 2px;
}

.subtitle {
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent-glow);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--border-color) 20%, var(--border-color) 80%, transparent);
    margin-top: 15px;
}

/* Alert Box */
.alert-box {
    background-color: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(226, 232, 240, 0.08);
    border-radius: 8px;
    padding: 12px;
    font-size: 11px;
    line-height: 1.5;
    color: var(--text-secondary);
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.alert-box i {
    color: var(--accent-glow);
    font-size: 14px;
    margin-top: 2px;
}

/* Forms */
.auth-form {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition-normal);
}

.auth-form.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

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

.form-group label {
    display: block;
    font-size: 12.5px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
    letter-spacing: 0.3px;
}

.form-group label i {
    margin-right: 6px;
    color: var(--accent-glow);
}

.form-group input {
    width: 100%;
    background-color: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 14.5px;
    color: #ffffff;
    font-family: var(--font-sans);
    transition: var(--transition-normal);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent-glow);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.2), inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

.otp-input-field {
    text-align: center;
    font-family: var(--font-mono) !important;
    font-size: 24px !important;
    letter-spacing: 6px;
    font-weight: 700;
}

.input-helper {
    font-size: 11.5px;
    color: var(--text-secondary);
    margin-top: 8px;
    line-height: 1.4;
}

.input-helper strong {
    color: #ffffff;
}

/* Buttons */
.btn-submit {
    width: 100%;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    border: none;
    border-radius: 8px;
    padding: 13px 20px;
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    color: #ffffff;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    transition: var(--transition-fast);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(37, 99, 235, 0.45);
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.btn-submit:active {
    transform: translateY(1px);
}

.btn-back {
    width: 100%;
    background-color: transparent;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    padding: 10px 20px;
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    margin-top: 12px;
    transition: var(--transition-fast);
}

.btn-back:hover {
    background-color: rgba(255, 255, 255, 0.03);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.15);
}

/* Loading states */
.btn-submit.loading .btn-text {
    visibility: hidden;
    opacity: 0;
}

.btn-submit.loading::after {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    border: 2px solid transparent;
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spinner 0.6s linear infinite;
}

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

/* Message alert box */
.message-box {
    display: none;
    opacity: 0;
    border-radius: 8px;
    padding: 12px;
    font-size: 12.5px;
    line-height: 1.4;
    margin-top: 20px;
    align-items: flex-start;
    gap: 8px;
    transition: var(--transition-normal);
}

.message-box.active {
    display: flex;
    opacity: 1;
}

.message-box.success {
    background-color: var(--success-bg);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--success-color);
}

.message-box.error {
    background-color: var(--error-bg);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--error-color);
}

/* Footer */
.card-footer {
    margin-top: 30px;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
    padding-top: 18px;
}

.card-footer p {
    font-size: 11px;
    color: var(--text-muted);
    line-height: 1.5;
}

.meta-ip {
    font-family: var(--font-mono);
    color: var(--accent-glow) !important;
    opacity: 0.7;
    margin-top: 5px;
}

/* ==========================================================================
   Rate-Limit Countdown Modal
   ========================================================================== */
.ratelimit-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(11, 15, 25, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.4s ease;
    padding: 20px;
}

.ratelimit-overlay.visible {
    opacity: 1;
}

.ratelimit-modal {
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid rgba(239, 68, 68, 0.35);
    border-radius: 16px;
    padding: 40px 35px;
    max-width: 420px;
    width: 100%;
    text-align: center;
    box-shadow: 0 0 60px rgba(239, 68, 68, 0.12),
                0 25px 50px -12px rgba(0, 0, 0, 0.8),
                inset 0 1px 0 rgba(255, 255, 255, 0.06);
    transform: translateY(20px);
    transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.ratelimit-overlay.visible .ratelimit-modal {
    transform: translateY(0);
}

.ratelimit-icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    color: #f87171;
    margin: 0 auto 20px auto;
    animation: pulse-red 2s infinite;
}

@keyframes pulse-red {
    0%   { box-shadow: 0 0 0 0px rgba(239, 68, 68, 0.4); }
    70%  { box-shadow: 0 0 0 12px rgba(239, 68, 68, 0); }
    100% { box-shadow: 0 0 0 0px rgba(239, 68, 68, 0); }
}

.ratelimit-title {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 700;
    color: #f8fafc;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

.ratelimit-desc {
    font-size: 12.5px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 28px;
}

.ratelimit-timer {
    font-family: var(--font-mono);
    font-size: 52px;
    font-weight: 700;
    color: #f87171;
    letter-spacing: 4px;
    margin-bottom: 10px;
    text-shadow: 0 0 20px rgba(239, 68, 68, 0.5);
    line-height: 1;
}

.ratelimit-hint {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 22px;
    line-height: 1.5;
}

.ratelimit-hint strong {
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

.ratelimit-bar-track {
    height: 4px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 99px;
    overflow: hidden;
}

.ratelimit-bar-fill {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, #ef4444, #f87171);
    border-radius: 99px;
    transition: width 1s linear;
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
}