:root {
    --primary: #3498db;
    --secondary: #7f8c8d;
    --dark: #2c3e50;
    --light: #ecf0f1;
    --accent: #00b4ff;
    --neon-glow: 0 0 10px #00b4ff, 0 0 20px #00b4ff, 0 0 30px #00b4ff;
    --error: #e74c3c;
    --success: #2ecc71;
    --bg: #ffffff;
    --card-bg: #f8f9fa;
    --text: #333333;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --ios-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    --ios-radius: 14px;
    --ios-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary: #2980b9;
    --secondary: #95a5a6;
    --dark: #1a252f;
    --light: #2c3e50;
    --accent: #00d9ff;
    --neon-glow: 0 0 10px #00d9ff, 0 0 20px #00d9ff, 0 0 30px #00d9ff;
    --error: #c0392b;
    --success: #27ae60;
    --bg: #121212;
    --card-bg: #1e1e1e;
    --text: #f0f0f0;
    --ios-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    padding-bottom: 100px;
    padding-top: env(safe-area-inset-top);
    padding-bottom: calc(80px + env(safe-area-inset-bottom));
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 100%;
    margin: 0 auto;
    padding: 20px 16px;
}

/* iOS Style Header */
header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
    padding-top: 10px;
}

.theme-toggle {
    position: absolute;
    top: 0;
    right: 0;
}

#themeBtn {
    background: var(--primary);
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 20px;
    cursor: pointer;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--ios-transition);
    box-shadow: var(--ios-shadow);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

#themeBtn:active {
    transform: scale(0.95);
    box-shadow: var(--neon-glow);
}

/* iOS Style Profile */
.profile-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto 20px;
    border: 4px solid var(--primary);
    box-shadow: var(--neon-glow);
    transition: var(--ios-transition);
    position: relative;
}

.profile-img:active {
    transform: scale(0.98);
}

.profile-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile h1 {
    font-size: 28px;
    margin-bottom: 8px;
    color: var(--primary);
    text-shadow: 0 0 10px rgba(0, 180, 255, 0.3);
    font-weight: 700;
    letter-spacing: -0.5px;
}

.profile p {
    color: var(--secondary);
    font-size: 16px;
    font-weight: 400;
}

/* iOS Style Navigation Bar */
.navbar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    display: flex;
    justify-content: space-around;
    padding: 12px 0;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: 0 -2px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--secondary);
    padding: 8px 16px;
    border-radius: var(--ios-radius);
    transition: var(--ios-transition);
    min-width: 70px;
    position: relative;
}

.nav-item.active {
    color: var(--primary);
    background: rgba(52, 152, 219, 0.1);
    box-shadow: var(--neon-glow);
}

.nav-item:active {
    transform: scale(0.95);
    background: rgba(52, 152, 219, 0.05);
}

.nav-icon {
    font-size: 22px;
    margin-bottom: 4px;
    transition: var(--ios-transition);
}

.nav-text {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: -0.2px;
}

/* iOS Style Pages */
.page {
    display: none;
}

.page.active {
    display: block;
    animation: iosFadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes iosFadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

section {
    margin-bottom: 32px;
}

h2 {
    font-size: 22px;
    margin-bottom: 24px;
    color: var(--primary);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--accent);
    text-shadow: 0 0 8px rgba(0, 180, 255, 0.3);
    font-weight: 700;
    letter-spacing: -0.3px;
}

/* iOS Style File Items */
.file-item {
    background-color: var(--card-bg);
    border-radius: var(--ios-radius);
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: var(--ios-shadow);
    transition: var(--ios-transition);
    border: 1px solid rgba(52, 152, 219, 0.1);
    position: relative;
    overflow: hidden;
}

.file-item:active {
    transform: scale(0.98);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15), var(--neon-glow);
    border-color: var(--accent);
}

.file-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.file-name {
    font-weight: 600;
    font-size: 17px;
    color: var(--primary);
    letter-spacing: -0.3px;
}

.file-size {
    color: var(--secondary);
    font-size: 13px;
    background: var(--bg);
    padding: 6px 12px;
    border-radius: 12px;
    font-weight: 500;
}

.file-desc {
    font-size: 15px;
    color: var(--text);
    margin-bottom: 16px;
    opacity: 0.8;
    line-height: 1.5;
}

/* iOS Style Buttons */
.download-btn {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border: none;
    border-radius: 12px;
    padding: 16px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    width: 100%;
    transition: var(--ios-transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.download-btn:active {
    transform: scale(0.98);
    box-shadow: var(--neon-glow);
}

/* iOS Style Social & Contact Links */
.social-links, .contact-links {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.social-item, .contact-item {
    background-color: var(--card-bg);
    border-radius: var(--ios-radius);
    padding: 24px;
    text-align: center;
    box-shadow: var(--ios-shadow);
    transition: var(--ios-transition);
    text-decoration: none;
    color: var(--text);
    border: 1px solid rgba(52, 152, 219, 0.1);
    position: relative;
}

.social-item:active, .contact-item:active {
    transform: scale(0.98);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15), var(--neon-glow);
    border-color: var(--accent);
}

.social-icon, .contact-icon {
    font-size: 32px;
    margin-bottom: 16px;
    display: block;
    transition: var(--ios-transition);
}

.social-name, .contact-name {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--primary);
    letter-spacing: -0.3px;
}

.social-username, .contact-username {
    font-size: 15px;
    color: var(--secondary);
    font-weight: 400;
}

/* iOS Style Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--card-bg);
    margin: 10% auto;
    padding: 28px;
    border-radius: var(--ios-radius);
    width: 90%;
    max-width: 400px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3), var(--neon-glow);
    position: relative;
    border: 1px solid var(--accent);
    animation: modalSlideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalSlideIn {
    from { 
        transform: scale(0.9) translateY(20px); 
        opacity: 0; 
    }
    to { 
        transform: scale(1) translateY(0); 
        opacity: 1; 
    }
}

.close {
    color: var(--secondary);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    transition: var(--ios-transition);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}

.close:active {
    background: rgba(0, 0, 0, 0.1);
    color: var(--primary);
}

.modal h3 {
    margin-bottom: 16px;
    color: var(--primary);
    text-align: center;
    text-shadow: 0 0 8px rgba(0, 180, 255, 0.3);
    font-size: 22px;
    font-weight: 700;
}

.modal p {
    margin-bottom: 24px;
    font-size: 16px;
    text-align: center;
    line-height: 1.5;
    color: var(--secondary);
}

/* iOS Style Verification */
.verification-list {
    margin-bottom: 24px;
    max-height: 300px;
    overflow-y: auto;
}

.verification-item {
    display: flex;
    align-items: center;
    margin-bottom: 12px;
    padding: 16px;
    background-color: var(--bg);
    border-radius: 12px;
    transition: var(--ios-transition);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.verification-item:active {
    transform: translateX(5px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.verification-item input {
    margin-right: 16px;
    transform: scale(1.2);
    accent-color: var(--primary);
}

.verification-item label {
    font-size: 16px;
    font-weight: 500;
    color: var(--text);
}

/* iOS Style Input */
#passwordInput {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--secondary);
    border-radius: 12px;
    margin-bottom: 24px;
    background-color: var(--bg);
    color: var(--text);
    font-size: 16px;
    transition: var(--ios-transition);
    font-weight: 400;
}

#passwordInput:focus {
    border-color: var(--accent);
    box-shadow: 0 0 10px rgba(0, 180, 255, 0.3);
    outline: none;
    transform: scale(1.02);
}

.modal-actions {
    display: flex;
    gap: 12px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border: none;
    border-radius: 12px;
    padding: 16px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    flex: 1;
    transition: var(--ios-transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.btn-primary:active:not(:disabled) {
    transform: scale(0.98);
    box-shadow: var(--neon-glow);
}

.btn-primary:disabled {
    background: var(--secondary);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.error-message {
    color: var(--error);
    font-size: 14px;
    margin-top: 12px;
    text-align: center;
    font-weight: 500;
}

/* iOS Style Loading */
.loading-overlay {
    display: none;
    position: fixed;
    z-index: 3000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    -webkit-backdrop-filter: blur(15px);
    backdrop-filter: blur(15px);
    justify-content: center;
    align-items: center;
    flex-direction: column;
    animation: modalFadeIn 0.3s ease;
}

.loading-spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid var(--accent);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
    box-shadow: var(--neon-glow);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-overlay p {
    color: white;
    font-size: 16px;
    text-shadow: 0 0 10px var(--accent);
    font-weight: 500;
}

/* iOS Style Scrollbars */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--secondary);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Enhanced Responsive Design */
@media (min-width: 768px) {
    .container {
        max-width: 500px;
    }
    
    .social-links, .contact-links {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 16px 12px;
    }
    
    .profile-img {
        width: 100px;
        height: 100px;
    }
    
    .file-item, .social-item, .contact-item {
        padding: 16px;
    }
    
    .modal-content {
        margin: 5% auto;
        padding: 20px;
    }
    
    .profile h1 {
        font-size: 24px;
    }
    
    .profile p {
        font-size: 14px;
    }
}

/* iPhone Notch Support */
@supports (padding: max(0px)) {
    body {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
    }
}

/* Haptic Feedback Simulation */
@media (hover: none) and (pointer: coarse) {
    .nav-item:active, 
    .file-item:active, 
    .social-item:active, 
    .contact-item:active,
    .download-btn:active,
    .btn-primary:active {
        transition: transform 0.1s ease;
    }
}