:root {
    /* Metallic Dark Silver Palette */
    --bg-main: #12161a;
    --silver-primary: #e2e8f0;
    --silver-bright: #ffffff;
    --silver-metallic-gradient: linear-gradient(135deg, #8a9ba8 0%, #d1d5db 50%, #4b5563 100%);
    --silver-btn-gradient: linear-gradient(135deg, #64748b 0%, #94a3b8 50%, #334155 100%);
    --silver-btn-hover: linear-gradient(135deg, #94a3b8 0%, #cbd5e1 50%, #475569 100%);
    
    --text-dark: #f8fafc;
    --text-muted: #94a3b8;
    --input-bg: #1e242d;
    --input-border: #334155;
    --focus-shadow: 0 4px 16px rgba(226, 232, 240, 0.15);
    --error-red: #f87171;
    --success-green: #34d399;
    --card-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.5);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    letter-spacing: -0.3px;
    -webkit-tap-highlight-color: transparent;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html, body {
    width: 100%;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    min-height: 100dvh;
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(rgba(148, 163, 184, 0.08) 1px, transparent 1px), 
        linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 20px 20px, 40px 40px, 40px 40px;
    background-position: 0 0, 0 0, 0 0;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
    color: var(--text-dark);
}

.bg-wave {
    position: absolute;
    left: 0;
    width: 100%;
    z-index: 0;
    pointer-events: none;
}

.bg-wave-top {
    top: 0;
    height: 11vh; 
    min-height: 82px; 
}

.bg-wave-bottom {
    bottom: env(safe-area-inset-bottom, 0px);
    height: 7vh;
    min-height: 48px;
    z-index: 2;
}

/* Header Top Bar Area */
.header-top-area {
    position: absolute;
    top: calc(10px + env(safe-area-inset-top));
    left: 16px;
    right: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 10;
}

.back-btn {
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    transition: background 0.2s ease;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.15);
    cursor: pointer;
}

.back-btn:active {
    background: rgba(255, 255, 255, 0.25);
}

.app-view {
    width: 100%;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: calc(90px + env(safe-area-inset-top)) 20px calc(45px + env(safe-area-inset-bottom)) 20px;
    position: relative;
    z-index: 1;
    box-sizing: border-box;
    max-width: 680px;
    margin: 0 auto;
}

.app-content-wrapper {
    width: 100%;
    max-width: 360px;
    display: flex;
    flex-direction: column;
    margin: 12px auto auto auto; 
}

/* Header Content & Curved Center Title Styling */
.header-content {
    text-align: center;
    margin-bottom: 2vh;
    perspective: 500px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.header-content h1 {
    font-size: 24px;
    font-weight: 800;
    color: var(--silver-bright);
    margin: 0 auto 6px auto;
    letter-spacing: -0.3px;
    text-transform: capitalize;
    text-align: center;
    display: inline-block;
    
    /* Curved 3D Arch Effect */
    transform: perspective(300px) rotateX(-12deg) scale(0.98);
    transform-origin: center bottom;
    text-shadow: 0px 6px 14px rgba(0, 0, 0, 0.7);
}

.metallic-title-accent {
    background: var(--silver-metallic-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 900;
    display: inline-block;
    padding: 2px 10px;
    
    /* Curved Metallic Border Styling */
    border-bottom: 2px solid rgba(226, 232, 240, 0.5);
    border-radius: 50% / 8px;
    box-shadow: 0px 4px 10px rgba(255, 255, 255, 0.05);
}

.header-content p {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 8px;
    text-align: center;
}

/* Header Login Link Positioning */
.top-login-link {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    text-decoration: none;
    margin-top: 4px;
    text-align: center;
}

.top-login-link span {
    text-decoration: underline;
    color: var(--silver-bright);
    font-weight: 700;
}

.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 2.5vh;
    font-size: 12px;
    font-weight: 700;
    color: var(--silver-primary);
}

.step-dot-active {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--silver-metallic-gradient);
    border: 2px solid #cbd5e1;
    box-shadow: 0 0 8px rgba(203, 213, 225, 0.4);
    transition: all 0.3s ease;
}

.step-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: #475569;
    transition: all 0.3s ease;
}

.registration-form, .verification-view {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.verification-view {
    display: none;
    animation: fadeIn 0.4s ease-out forwards;
}

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

.input-group {
    position: relative;
    width: 100%;
}

.input-box {
    width: 100%;
    height: 48px;
    background-color: var(--input-bg);
    border: 1.5px solid var(--input-border);
    border-radius: 12px;
    padding: 0 42px 0 14px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-dark);
    outline: none;
    transition: all 0.2s ease;
}

.input-box:focus {
    border-color: #94a3b8;
    background-color: #171c23;
    box-shadow: var(--focus-shadow);
}

.field-label {
    position: absolute;
    top: -7px;
    left: 12px;
    background-color: var(--bg-main); 
    padding: 0 5px;
    font-size: 11px;
    font-weight: 700;
    color: var(--silver-primary);
    z-index: 2;
    cursor: pointer;
}

.label-highlight {
    color: #cbd5e1;
    font-weight: 700;
}

.phone-input-wrapper {
    display: flex;
    align-items: center;
}

.country-trigger {
    position: absolute;
    left: 12px;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    height: 100%;
    padding-right: 8px;
    border-right: 1.5px solid var(--input-border);
}

.trigger-flag {
    font-size: 16px;
    line-height: 1;
}

.trigger-code {
    font-size: 13px;
    font-weight: 700;
    color: var(--silver-primary);
}

.trigger-arrow {
    font-size: 8px;
    color: var(--text-muted);
    margin-top: 1px;
}

.input-box.phone-indent {
    padding-left: 98px;
}

.input-icon-right {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.pin-toggle-btn {
    background: none;
    border: none;
    outline: none;
    cursor: pointer;
    padding: 6px;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    transition: color 0.2s ease;
    pointer-events: auto !important;
}

.pin-toggle-btn:hover {
    color: var(--silver-bright);
}

.pin-toggle-btn svg,
.pin-toggle-btn svg * {
    pointer-events: none;
}

/* Dynamic Popup Hints for PIN */
.pin-hint-popup {
    display: none;
    margin-top: 6px;
    font-size: 0.70rem;
    color: #cbd5e1;
    font-weight: 500;
    background: rgba(30, 41, 59, 0.9);
    border: 1px solid #475569;
    padding: 6px 10px;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
    animation: fadeIn 0.2s ease-out;
}

.pin-feedback-popup {
    display: none;
    font-size: 0.70rem;
    font-weight: 600;
    margin-top: 4px;
    padding: 2px 4px;
    animation: fadeIn 0.2s ease-out;
}

.otp-container {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin: 15px 0;
}

.otp-input {
    width: 48px;
    height: 52px;
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: 12px;
    text-align: center;
    font-size: 20px;
    font-weight: 800;
    color: var(--silver-bright);
    outline: none;
    transition: all 0.2s ease;
}

.otp-input:focus {
    border-color: #cbd5e1;
    background-color: #171c23;
    box-shadow: var(--focus-shadow);
}

.resend-text {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 10px;
    font-weight: 500;
}

.resend-link {
    color: var(--silver-primary);
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
}

.resend-link.disabled {
    color: #64748b;
    cursor: not-allowed;
    font-weight: 500;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-card {
    width: 90%;
    max-width: 340px;
    background: #1e242d;
    border: 1px solid #334155;
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.6);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.95) translateY(8px);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    max-height: 70vh;
}

.modal-overlay.active .modal-card {
    transform: scale(1) translateY(0);
}

.modal-search-wrapper { padding: 12px; border-bottom: 1px solid #334155; }
.modal-search { width: 100%; height: 40px; background: #12161a; border: 1.5px solid #334155; border-radius: 10px; padding: 0 12px; font-size: 14px; font-weight: 600; color: var(--silver-bright); outline: none; }
.modal-search:focus { border-color: #cbd5e1; background: #0f1216; }
.country-list-scroll { overflow-y: auto; flex: 1; padding: 6px 0; }
.country-item { display: flex; align-items: center; padding: 10px 18px; cursor: pointer; transition: background 0.15s ease; gap: 12px; }
.country-item:active { background: #2a323d; }
.item-flag { font-size: 18px; }
.item-name { font-size: 14px; font-weight: 600; color: var(--silver-bright); flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item-code { font-size: 13px; font-weight: 700; color: var(--text-muted); }

.form-action-area {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-top: 4px;
}

.btn-submit {
    width: 100%;
    height: 48px;
    background: var(--silver-btn-gradient);
    color: #ffffff;
    font-size: 14px;
    font-weight: 700;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 30px; 
    cursor: pointer;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
    transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.btn-submit:hover {
    background: var(--silver-btn-hover);
}

.btn-submit:active {
    transform: scale(0.98);
}

.btn-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.toast-container {
    position: fixed;
    top: calc(16px + env(safe-area-inset-top));
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.96);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    color: #ffffff;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 13px;
    font-weight: 600;
    z-index: 3999; 
    display: none;
    box-shadow: 0 8px 20px rgba(0,0,0,0.5);
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    width: 85%;
    max-width: 340px;
}