/* ========================================
   Home Screen - Full Width Edge-to-Edge
======================================== */
.home-screen {
    display: none;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    position: relative;
    overflow: hidden;
    background: transparent;
}

.home-topbar {
    width: 100%;
    max-width: 980px;
    margin: 0 auto;
    padding: var(--space-2) var(--space-6) 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 48px;
    position: relative;
    z-index: 2;
}

.home-screen.active {
    display: flex;
}

/* ========================================
   Centered Content Container
======================================== */
.home-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: var(--space-6);
    padding-top: var(--space-8);
    max-width: 980px;
    margin: 0 auto;
    width: 100%;
    min-height: calc(100vh - 72px);
    transition: var(--transition-spring);
}

.home-screen.chat-active .home-container {
    justify-content: flex-end;
    padding-top: 0;
    padding-bottom: var(--space-5);
    min-height: 0;
    order: 2;
    flex: 0 0 auto;
}

/* Brand - Hidden in app shell */
.home-brand {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 12px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(245, 184, 0, 0.18);
    background: rgba(245, 184, 0, 0.08);
    color: var(--accent);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    margin-bottom: var(--space-4);
}

.home-hero {
    width: 100%;
    max-width: 860px;
    padding: clamp(24px, 4vw, 36px);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-default);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 26%),
        var(--bg-panel);
    box-shadow: var(--shadow-floating);
    position: relative;
    overflow: visible;
}

.home-hero::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    background:
        radial-gradient(circle at top left, rgba(245, 184, 0, 0.12), transparent 28%),
        radial-gradient(circle at bottom right, rgba(96, 165, 250, 0.08), transparent 26%);
    opacity: 0.9;
}

.home-hero > * {
    position: relative;
    z-index: 1;
}

.home-composer-card {
    width: 100%;
    max-width: 860px;
    margin-top: var(--space-4);
    padding: var(--space-5);
    border-radius: var(--radius-2xl);
    transition: var(--transition-spring);
}

/* ========================================
   Welcome Section
======================================== */
.home-welcome {
    text-align: center;
    margin-bottom: var(--space-8);
}

.home-welcome h1 {
    font-size: clamp(2.4rem, 5vw, 3.4rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    letter-spacing: -0.04em;
    line-height: 1.1;
}

.home-welcome p {
    font-size: 1.02rem;
    color: var(--text-secondary);
    font-weight: 500;
    max-width: 520px;
    margin: 0 auto;
}

.home-screen.chat-active .home-hero {
    display: none;
}

/* ========================================
   Subject Selector - Pill Dropdown
======================================== */
.home-subject-selector {
    display: flex;
    justify-content: center;
    margin-bottom: 0;
    position: relative;
}

.home-subject-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-default);
    background: var(--bg-glass);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-spring);
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
}

.home-subject-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-strong);
    transform: translateY(-1px);
}

.home-subject-btn svg {
    width: 14px;
    height: 14px;
    stroke: var(--text-tertiary);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.home-subject-btn.open svg {
    transform: rotate(180deg);
}

.home-subject-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    min-width: 200px;
    max-height: 320px;
    overflow-y: auto;
    background: var(--bg-elevated);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    padding: 4px;
    z-index: 100;
    box-shadow: var(--shadow-floating);
    animation: fadeIn 0.15s ease;
}

[data-theme="dark"] .home-subject-dropdown {
    background: var(--bg-elevated);
}

.home-subject-dropdown.hidden {
    display: none;
}

.home-subject-option {
    display: block;
    width: 100%;
    padding: 10px 14px;
    border: none;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 400;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}

.home-subject-option:hover {
    background: var(--bg-hover);
}

.home-subject-option.active {
    background: var(--accent-subtle);
    color: var(--accent);
    font-weight: 500;
}

/* ========================================
   Input Area - Minimal
======================================== */
.home-input-wrapper {
    width: 100%;
    position: relative;
    margin-bottom: var(--space-4);
}

.home-input-container {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    background: var(--bg-inset);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-default);
    padding: 14px var(--space-4);
    transition: var(--transition-spring);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.02);
}

.home-input-container:focus-within {
    background: rgba(245, 184, 0, 0.04);
    border-color: rgba(245, 184, 0, 0.26);
    box-shadow: 0 0 0 4px rgba(245, 184, 0, 0.08), var(--shadow-md);
}

/* Main Input Field */
#homeInput {
    flex: 1;
    background: transparent;
    outline: none;
    border: none;
    box-shadow: none;
    font-size: 1.02rem;
    color: var(--text-primary);
    padding: var(--space-3) var(--space-2);
    min-width: 0;
}

#homeInput::placeholder {
    color: var(--text-placeholder);
}

/* Send Button */
.home-send-btn {
    width: 52px;
    height: 52px;
    border-radius: 18px;
    background: var(--brand-gradient);
    color: var(--accent-text);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-spring);
    flex-shrink: 0;
    box-shadow: 0 14px 32px rgba(245, 184, 0, 0.22);
}

.home-send-btn:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.03);
    box-shadow: var(--shadow-glow);
}

.home-send-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    box-shadow: none;
}

.home-send-btn svg {
    width: 20px;
    height: 20px;
}

/* Plus Button */
.home-plus-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-glass);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-spring);
    flex-shrink: 0;
    cursor: pointer;
    border: 1px solid var(--border-default);
}

.home-plus-btn:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    transform: translateY(-1px);
}

.home-plus-btn.open {
    color: var(--accent);
    border-color: var(--accent);
}

.home-plus-btn svg {
    width: 18px;
    height: 18px;
    transition: transform 0.2s ease;
}

.home-plus-btn.open svg {
    transform: rotate(45deg);
}

/* Plus Dropdown */
.home-plus-dropdown {
    position: absolute;
    bottom: calc(100% + var(--space-2));
    left: var(--space-4);
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-default);
    box-shadow: var(--shadow-floating);
    padding: var(--space-2);
    z-index: 100;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    animation: plusDropdownIn 0.15s ease;
}

.home-plus-dropdown.hidden {
    display: none;
}

@keyframes plusDropdownIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.home-plus-option {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-spring);
    white-space: nowrap;
    border: none;
    width: 100%;
    text-align: left;
}

.home-plus-option:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateX(2px);
}

.home-plus-option svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

/* Photo Preview - compact strip above input bar */
.home-photo-preview {
    display: none;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    margin-bottom: var(--space-2);
    background: rgba(245, 184, 0, 0.08);
    border: 1px solid rgba(245, 184, 0, 0.14);
    border-radius: var(--radius-md);
}

.home-photo-preview.visible {
    display: flex;
}

.home-photo-preview img {
    width: 36px;
    height: 36px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.home-photo-preview-name {
    flex: 1;
    font-size: 12px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}

.home-photo-remove {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background: var(--bg-active);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    flex-shrink: 0;
    margin-left: auto;
}

.home-photo-remove:hover {
    background: var(--destructive-subtle);
    color: var(--destructive);
}

.home-photo-remove svg {
    width: 14px;
    height: 14px;
}

/* Hide action buttons when photo is attached */
.home-screen.has-photo .home-actions,
.home-screen.has-photo .home-hint {
    display: none;
}

/* ========================================
   Action Buttons - Minimal
======================================== */
.home-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-3);
    margin-bottom: var(--space-4);
}

.home-action-btn {
    min-height: 78px;
    border-radius: var(--radius-xl);
    background: var(--bg-glass);
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4);
    border: 1px solid var(--border-default);
    transition: var(--transition-spring);
    position: relative;
    text-align: left;
}

.home-action-btn:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
    border-color: var(--border-strong);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.home-action-btn.active {
    color: var(--accent);
    background: linear-gradient(135deg, rgba(245, 184, 0, 0.16), rgba(245, 184, 0, 0.08));
    border-color: rgba(245, 184, 0, 0.2);
}

.home-action-btn svg {
    width: 20px;
    height: 20px;
}

.home-action-btn span {
    font-size: 13px;
    font-weight: 600;
    line-height: 1.35;
}

/* Tooltip */
.home-action-btn::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -32px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--space-1) var(--space-3);
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-fast);
    pointer-events: none;
}

[data-theme="dark"] .home-action-btn::after {
    background: var(--bg-elevated);
}

.home-action-btn:hover::after {
    opacity: 1;
    visibility: visible;
}

.home-screen.chat-active .home-actions,
.home-screen.chat-active .home-hint,
.home-screen.chat-active .home-practice-setup {
    display: none;
}

/* ========================================
   Hint Text
======================================== */
.home-hint {
    font-size: 13px;
    color: var(--text-tertiary);
    text-align: center;
}

/* ========================================
   Chat Area - Expanding Messages
======================================== */
.home-chat-area {
    display: none;
    flex-direction: column;
    flex: 1;
    width: 100%;
    max-width: 980px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    overflow: hidden;
    min-height: 0;
}

.home-chat-area.visible {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.home-screen.chat-active .home-chat-area {
    order: 1;
    flex: 1 1 auto;
}

.home-screen.chat-active {
    display: flex;
    flex-direction: column;
}

.home-screen.chat-active .home-composer-card {
    max-width: 980px;
    margin-top: 0;
    padding: 0 var(--space-6) var(--space-5);
    border-radius: 0;
    border: none;
    background: transparent;
    box-shadow: none;
}

.home-screen.chat-active .home-input-wrapper {
    margin-bottom: 0;
}

.home-screen.chat-active .home-input-container {
    max-width: 980px;
    margin: 0 auto;
    border-radius: 22px;
    background: var(--bg-panel);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-spring);
}

.home-screen.chat-active .home-input-container:focus-within {
    border-color: rgba(245, 184, 0, 0.3);
    box-shadow: 0 0 0 4px rgba(245, 184, 0, 0.1), var(--shadow-md);
    background: var(--bg-panel-elevated);
}

.home-new-chat-btn {
    display: none;
}

.home-screen.chat-active .home-topbar {
    justify-content: space-between;
    padding-top: var(--space-3);
    padding-bottom: var(--space-2);
}

.home-screen.chat-active .home-new-chat-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    background: var(--bg-glass);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-spring);
}

.home-new-chat-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--border-strong);
    transform: translateY(-1px);
}

.home-new-chat-btn svg {
    width: 14px;
    height: 14px;
}

.home-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4) 0 var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
    min-height: 0;
    border: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    max-width: 860px;
    width: 100%;
    margin: 0 auto;
}

.home-chat-messages::before {
    content: none;
}

/* Message Bubble */
.home-message {
    display: flex;
    gap: var(--space-3);
    animation: slideUp 0.3s ease;
}

.home-message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-default);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.home-message-avatar svg {
    width: 18px;
    height: 18px;
    stroke: var(--text-tertiary);
}

.home-message-content {
    flex: 1;
    padding: var(--space-4) var(--space-5);
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-primary);
    box-shadow: none;
}

/* User message */
.home-message.user {
    flex-direction: row-reverse;
}

.home-message.user .home-message-avatar {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
}

.home-message.user .home-message-avatar svg {
    stroke: var(--accent-text);
}

.home-message.user .home-message-content {
    background: rgba(245, 184, 0, 0.08);
    border-color: rgba(245, 184, 0, 0.16);
    color: var(--text-primary);
    flex: 0 1 auto;
    max-width: 75%;
}

/* AI message */
.home-message.ai .home-message-avatar {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
}

.home-message.ai .home-message-avatar svg {
    stroke: var(--accent-text);
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 6px;
    padding: var(--space-1) 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-tertiary);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

.typing-indicator span:nth-child(1) { animation-delay: -0.32s; }
.typing-indicator span:nth-child(2) { animation-delay: -0.16s; }
.typing-indicator span:nth-child(3) { animation-delay: 0s; }

@keyframes bounce {
    0%, 80%, 100% { 
        transform: scale(0.6); 
        opacity: 0.4; 
    }
    40% { 
        transform: scale(1); 
        opacity: 1; 
    }
}

/* Message image */
.home-message-image {
    max-width: 280px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-2);
}

/* ========================================
   Practice Setup - Inline Section
======================================== */
.home-practice-setup {
    display: none;
    width: 100%;
    padding: var(--space-5);
    background: var(--bg-inset);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    margin-top: var(--space-2);
}

.home-practice-setup.visible {
    display: block;
    animation: fadeIn 0.2s ease;
}

.home-practice-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.home-practice-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.home-practice-chip {
    padding: 10px 16px;
    border-radius: var(--radius-full);
    background: var(--bg-glass);
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 600;
    transition: var(--transition-spring);
}

.home-practice-chip:hover {
    color: var(--text-primary);
    background: var(--bg-active);
    transform: translateY(-1px);
}

.home-practice-chip.selected {
    background: var(--accent);
    color: var(--accent-text);
}

/* ========================================
   Hidden File Input
======================================== */
#homePhotoInput {
    display: none;
}

/* ========================================
   Responsive Design
======================================== */
@media (max-width: 768px) {
    .home-topbar {
        padding: var(--space-2) var(--space-4) 0;
    }

    .home-container {
        padding: var(--space-4);
        padding-top: var(--space-5);
    }

    .home-chat-area {
        padding: 0 var(--space-4);
    }

    .home-welcome h1 {
        font-size: 1.75rem;
    }

    .home-welcome {
        margin-bottom: var(--space-6);
    }

    .home-hero {
        padding: var(--space-5);
    }

    .home-input-container {
        padding: var(--space-2) var(--space-3);
    }

    #homeInput {
        font-size: 16px;
        padding: var(--space-2);
    }

    .home-send-btn {
        width: 48px;
        height: 48px;
    }

    .home-plus-btn {
        width: 44px;
        height: 44px;
    }

    .home-action-btn {
        min-height: 72px;
        padding: var(--space-3);
    }

    .home-action-btn::after {
        display: none;
    }

    .home-actions {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .home-screen.chat-active .home-composer-card {
        padding: 0 0 var(--space-4);
    }

    .home-message-avatar {
        width: 32px;
        height: 32px;
    }

    .home-message-content {
        padding: var(--space-3) var(--space-4);
        font-size: 13.5px;
    }

    .home-message {
        gap: var(--space-2);
    }

    .home-chat-messages {
        gap: var(--space-4);
    }

    .home-new-chat-btn {
        min-height: 44px;
    }

    .home-subject-btn {
        min-height: 44px;
    }

    .home-practice-chip {
        min-height: 44px;
    }
}

@media (max-width: 480px) {
    .home-topbar {
        padding: var(--space-2) var(--space-3) 0;
    }

    .home-container {
        padding: var(--space-3);
        padding-top: var(--space-4);
    }

    .home-welcome h1 {
        font-size: 1.5rem;
    }

    .home-welcome p {
        font-size: 14px;
    }

    .home-action-btn {
        min-height: 68px;
    }

    .home-action-btn svg {
        width: 20px;
        height: 20px;
    }

    .home-chat-area {
        padding: 0 var(--space-3);
    }

    .home-chat-messages {
        padding: var(--space-3) 0 var(--space-5);
        gap: var(--space-3);
    }

    .home-hero {
        padding: var(--space-4);
        border-radius: var(--radius-xl);
    }

    .home-screen.chat-active .home-composer-card {
        padding: 0 0 var(--space-3);
    }

    .home-screen.chat-active .home-input-container {
        border-radius: var(--radius-lg);
    }

    .home-plus-dropdown {
        left: 0;
        right: var(--space-3);
        min-width: auto;
    }
}