/* ===============================================
   VPN VIETNAM - AUTH.CSS
   Authentication Pages Styles (Login/Register)
   Version: 1.0.0
   Date: 2025-11-08
   =============================================== */

:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg-dark: #f7f9fc;
    --bg-darker: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-primary: 'Outfit', sans-serif;
    --font-secondary: 'Space Grotesk', monospace;
}

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

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

/* ===============================================
   ANIMATED BACKGROUND
   =============================================== */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, var(--bg-darker) 0%, var(--bg-dark) 60%, #eef3ff 100%);
    z-index: -2;
}

.bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.16;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #6366f1 0%, transparent 70%);
    top: -10%;
    left: -10%;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #ec4899 0%, transparent 70%);
    top: 20%;
    right: -5%;
    animation-delay: 3s;
}

.shape-3 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, #10b981 0%, transparent 70%);
    bottom: -10%;
    left: 30%;
    animation-delay: 6s;
}

@keyframes 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); }
}

/* ===============================================
   HEADER
   =============================================== */
.header {
    padding: 1.5rem 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 45px;
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
    transition: var(--transition);
}

.logo img:hover {
    filter: drop-shadow(0 0 15px rgba(99, 102, 241, 0.8));
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav a:hover {
    color: var(--text-primary);
}

.btn-account {
    background: var(--gradient-primary);
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    color: #ffffff !important;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-account:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition);
}

/* ===============================================
   LOGIN/REGISTER WRAPPER
   =============================================== */
.login-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
}

.form-container {
    width: 100%;
    max-width: 500px;
    background: #ffffff;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: 25px;
    padding: 3rem;
    box-shadow: 0 20px 45px rgba(15, 23, 42, 0.12);
    position: relative;
    overflow: hidden;
    animation: slideUp 0.5s ease-out;
}

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

.form-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.form-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.form-header img {
    height: 55px;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 15px rgba(99, 102, 241, 0.6));
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        filter: drop-shadow(0 0 15px rgba(99, 102, 241, 0.6));
    }
    to {
        filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.9));
    }
}

.form-header h2 {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: var(--font-secondary);
    margin: 0 0 0.5rem 0;
}

.form-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

/* ===============================================
   MESSAGES
   =============================================== */
.error, .success {
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
}

.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
    animation: shake 0.4s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.error::before {
    content: '\f071';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 1.2rem;
}

.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: var(--secondary);
    animation: slideIn 0.3s ease-out;
}

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

.success::before {
    content: '\f058';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 1.2rem;
}

/* ===============================================
   FORM ELEMENTS
   =============================================== */
form label {
    display: block;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

form label i {
    color: var(--primary-light);
    margin-right: 0.5rem;
}

.required {
    color: var(--danger);
}

form input[type="text"],
form input[type="email"],
form input[type="password"] {
    width: 100%;
    padding: 1rem 1.25rem;
    background: #f8fafc;
    border: 1px solid #d7deea;
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    margin-bottom: 1.5rem;
    font-family: var(--font-primary);
}

form input::placeholder {
    color: #9ca3af;
}

form input:focus {
    outline: none;
    border-color: var(--primary);
    background: #ffffff;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* ===============================================
   PASSWORD WRAPPER
   =============================================== */
.password-wrapper {
    position: relative;
    margin-bottom: 1.5rem;
}

.password-wrapper input {
    margin-bottom: 0 !important;
    padding-right: 3rem;
}

.toggle-password {
    position: absolute;
    right: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

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

/* ===============================================
   CAPTCHA
   =============================================== */
.captcha-wrapper {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 0.5rem;
}

.captcha-wrapper input {
    flex: 1;
    margin-bottom: 0 !important;
}

#captcha-img {
    height: 50px;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

#captcha-img:hover {
    border-color: var(--primary);
    transform: scale(1.05) rotate(2deg);
}

#captcha-info {
    display: block;
    color: var(--secondary);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

/* ===============================================
   BUTTON
   =============================================== */
.form-container form:not(.verify-step-form) button[type="submit"] {
    width: 100%;
    padding: 1.25rem;
    background: var(--gradient-primary);
    color: #ffffff;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-primary);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
    position: relative;
    overflow: hidden;
}

.form-container form:not(.verify-step-form) button[type="submit"]::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: var(--transition);
}

.form-container form:not(.verify-step-form) button[type="submit"]:hover::before {
    left: 100%;
}

.form-container form:not(.verify-step-form) button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(99, 102, 241, 0.6);
}

.form-container form:not(.verify-step-form) button[type="submit"]:active {
    transform: translateY(0);
}

/* ===============================================
   EMAIL VERIFY STEP (register.php)
   =============================================== */
.verify-step-form {
    margin-bottom: 0;
}

.verify-step-form input[readonly] {
    background: #f1f5f9;
    color: var(--text-secondary);
    cursor: default;
}

.verify-step-form .verify-btn-stack {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin-top: 0.25rem;
}

.verify-step-form .verify-btn-stack button {
    width: 100%;
    margin: 0;
    border-radius: 12px;
    font-family: var(--font-primary);
    cursor: pointer;
    transition: var(--transition);
    position: static;
    overflow: visible;
}

.verify-step-form .verify-btn-stack button::before {
    display: none !important;
}

.verify-step-form .btn-auth-primary {
    padding: 1.15rem 1.25rem;
    background: var(--gradient-primary);
    color: #ffffff;
    border: none;
    font-size: 1.05rem;
    font-weight: 700;
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.35);
}

.verify-step-form .btn-auth-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 35px rgba(99, 102, 241, 0.5);
}

.verify-step-form .btn-auth-secondary {
    padding: 0.95rem 1.25rem;
    background: #f8fafc;
    color: var(--text-primary);
    border: 1px solid #d7deea;
    font-size: 1rem;
    font-weight: 600;
    box-shadow: none;
}

.verify-step-form .btn-auth-secondary:hover {
    background: #eef2ff;
    border-color: var(--primary-light);
    color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.12);
}

.verify-step-form .btn-auth-secondary i {
    color: var(--primary);
    margin-right: 0.35rem;
}

.verify-step-form .verify-btn-stack a.btn-auth-link {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    background: transparent;
    color: var(--primary);
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    text-align: center;
    text-decoration: underline;
    box-shadow: none;
    box-sizing: border-box;
}

.verify-step-form .verify-btn-stack a.btn-auth-link:hover {
    color: var(--primary-dark);
    background: rgba(99, 102, 241, 0.06);
    transform: none;
}

/* ===============================================
   LINKS
   =============================================== */
.form-container > p {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.form-container > p a {
    color: var(--primary-light);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.form-container > p a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

/* ===============================================
   FOOTER
   =============================================== */
.footer {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    padding: 2rem;
    text-align: center;
}

.footer-container p {
    color: var(--text-secondary);
    margin: 0;
}

/* ===============================================
   RESPONSIVE
   =============================================== */
@media (max-width: 768px) {
    .nav {
        display: none;
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 400px;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        padding: 6rem 2rem 2rem;
        transition: var(--transition);
        box-shadow: -10px 0 30px rgba(15, 23, 42, 0.18);
        z-index: 99;
    }

    .nav.active {
        right: 0;
        display: block;
    }

    .nav ul {
        flex-direction: column;
        gap: 1.5rem;
        align-items: flex-start;
    }

    .menu-toggle {
        display: flex;
        z-index: 100;
    }

    .menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .form-container {
        padding: 2rem 1.5rem;
    }

    .form-header h2 {
        font-size: 1.5rem;
    }

    .captcha-wrapper {
        flex-direction: column;
    }

    .captcha-wrapper input {
        width: 100%;
    }

    .login-wrapper {
        padding: 2rem 1rem;
    }
}

@media (max-width: 480px) {
    .form-header img {
        height: 45px;
    }

    .form-header h2 {
        font-size: 1.3rem;
    }

    form input[type="text"],
    form input[type="email"],
    form input[type="password"] {
        padding: 0.875rem 1rem;
        font-size: 0.95rem;
    }

    .form-container form:not(.verify-step-form) button[type="submit"] {
        padding: 1rem;
        font-size: 1rem;
    }
}